Marburg virus is closely related to Ebola. (C. Bickel/Science Translational Medicine) 
 
 A 30-year-old hospital technician died of the Marburg virus this weekend in Uganda, health officials there announced Sunday. Marburg, like Ebola, is a hemorrhagic fever. It's rare but severe. 
 
 According to NBC's Monday report, officials in Uganda have quarantined about 80 people who came into contact with the victim, one of whom — the man's brother — has developed the early symptoms of the disease. Sixty of those quarantined are health-care workers. 
 
 On Tuesday, Uganda's Ministry of Health said in an emailed statement that testing on 11 potential cases of Marburg came back negative, including that of the victim's brother. Those who still show symptoms similar to Marburg three days from now will be re-tested at that time, the ministry added. 
 
 As with Ebola, there is no cure for the virus. And like Ebola, Marburg can have a high death rate for those infected. That's leading many to wonder whether the Marburg case will begin yet another deadly outbreak of a terrifying disease in Africa, even though the bulk of the evidence suggests otherwise. 
 
 What is Marburg — and what are the symptoms? 
 
 Ebola and Marburg are the exclusive members of the Filovirus family of hemorrhagic fevers. 
 
 Marburg has an incubation period of five to 10 days, according to the Centers for Disease Control and Prevention. After that, infected individuals can develop a severe headache, myalgia, a fever and chills. Like Ebola, those initial symptoms are similar to many other diseases, including malaria. 
 
 After a few days, the symptoms worsen. They can include nausea, vomiting, chest pain, a sore throat, abdominal pain, diarrhea and a rash. Eventually, severe cases progress to "jaundice, inflammation of the pancreas, severe weight loss, delirium, shock, liver failure, massive hemorrhaging and multi-organ dysfunction," the CDC explains. 
 
 There's a huge range in the disease's fatality rate in previous outbreaks, from 23 percent to 90 percent. 
 
 How do you catch it? 
 
 Marbug, like Ebola, is not an airborne virus. The disease is spread through direct contact with the blood, tissues or bodily fluids of an infected person or, as has happened in many cases before, an infected primate or fruit bat. 
 
 Although Marburg seems to have its origin in and around Uganda, the first outbreak was actually in Europe: In 1967, laboratory workers in Germany and what was then Yugoslavia fell ill after handling African green monkeys imported from Uganda. There were 31 reported human cases and seven deaths, according to the CDC. 
 
 Other outbreaks have originated with travelers who visited caves inhabited by likely vectors of the disease, like the Kitum Cave in Mount Elgon National Park in Kenya. It's believed that fruit bat guano is responsible for passing the disease along to humans in multiple instances. 
 
 In 1998, a larger-scale outbreak of Marburg infected 154 people, killing 128. Most of those infected were young males working in a gold mine there, according to the CDC. Another large outbreak in Angola infected 252 people and killed 227 in 2004. 
 
 Once a human catches the disease from an animal vector, it spreads person to person through direct contact. Often, as with Ebola, the people who care for human victims of Marburg are at the highest risk of becoming infected themselves. 
 
 What's the treatment? 
 
 There is no specific treatment for Marburg, nor is there a proven vaccine or cure. Hospitalized patients should receive "general supportive therapy," the World Health Organization notes. That includes treating any complicating infections, balancing fluids and electrolytes and replacing any blood loss. 
 
 Because of Marburg's close relation to Ebola, there are experimental treatments being developed by some of the same companies working on Ebola drugs. Tekmira pharmaceutical announced that it had tested a drug on lab monkeys infected with a particularly deadly strain of Marburg. Many of the animals treated with the drug, even after the onset of symptoms, recovered, according to Reuters. 
 
 Tekmira makes TKM-Ebola, one of a handful of experimental Ebola treatments used on Americans who caught Ebola in West Africa. 
 
 Will the Marburg virus be at the center of the next terrifying outbreak? 
 
 We can't predict the future, but this seems extremely unlikely. Uganda has experienced previous outbreaks of both Ebola and Marburg and controlled them. Here's what the country's prime minister had to say about the potential for a large-scale outbreak in his country after the Marburg victim died: 
 
 Marburg is a Viral Hemorrhagic fever caused by the Marburg virus. MOH has put in place rigorous surveillance & disease control measures — Dr. Ruhakana Rugunda (@RuhakanaR) October 5, 2014 
 
 Uganda has previously successfully handled similar situations of health threats involving Hemorrhagic fevers #Marbugdisease #Ebola — Dr. Ruhakana Rugunda (@RuhakanaR) October 5, 2014 
 
 Uganda has experience and adequate capacity to deal with this health threat & World Health Organisation has been informed #Marburgdisease — Dr. Ruhakana Rugunda (@RuhakanaR) October 5, 2014 
 
 Ruhakana Rugunda, who became prime minister in 2014, is a physician who used to serve as the country's health minister. 
 
 According to the CDC, the most recent Marburg outbreak in Uganda infected 15 people and killed four. The outbreak lasted three weeks. 
 
 Although Marburg is deadly, it is not particularly easy to catch. If an outbreak is identified early and controlled, it is unlikely to escalate the way the current Ebola outbreak has in West Africa. 
 
 [This post has been updated] ||||| Story highlights 30-year-old male health worker in Uganda dies of Marburg 
 
 Marburg is an Ebola-like hemorrhagic fever 
 
 99 put into isolation 
 
 At least 11 test negative 
 
 Three days after a fatal case of Marburg hemorrhagic fever was diagnosed in Uganda, 99 people have been quarantined in four different locations across the East African country, as field epidemiologists and surveillance officers continue to closely monitor all people who got into contact with only victim. 
 
 More than 60 health workers form the bulk of people under quarantine after they were identified as having contact with a 30-year old male health worker who died September 28 of Marburg -- an Ebola-like hemorrhagic fever. 
 
 "As of today, a total of 99 contacts are under follow up. All the contacts are still in a healthy condition," Dr. Jane Ruth Aceng, director general for health services in Uganda, said in the latest update on the outbreak on Tuesday. 
 
 "The National Taskforce through the field epidemiologists and surveillance officers continues to closely monitor all people who got into contact with this confirmed case," she noted. 
 
 The dead health worker was a radiographer in a hospital in the capital of Kampala and also at Mpigi District Health Center IV, places where authorities say he made contact with colleagues. 
 
 Aceng revealed that at least 11 people have tested negative after results from Uganda Virus Research Institute (UVRI) indicate that although the suspects had developed signs and symptoms similar to that of the disease, they did not contract the virus. 
 
 "However, for those who continue to have signs, tests will be run again after three days," Dr. Aceng said. 
 
 45 photos: The Ebola epidemic 45 photos: The Ebola epidemic An Ebola survivor participates in a study in Monrovia, Liberia, on June 17. The country launched a five-year study to unravel the mystery of the long-term health effects that plague survivors of the viral disease. Since the epidemic started more than a year ago in a remote village in Guinea, more than 11,000 people have died, the vast majority in three West African nations, according to the latest numbers from the World Health Organization . And that number is believed to be low, since there was widespread under-reporting of cases, according to WHO. Hide Caption 1 of 45 45 photos: The Ebola epidemic Women in Monrovia celebrate after the World Health Organization declared Liberia Ebola-free on May 9. Other cases have recurred since, however. Two people in Liberia have died of the disease since the end of June, just weeks after the WHO declared the nation free of the disease. Hide Caption 2 of 45 45 photos: The Ebola epidemic A man walks past an Ebola awareness painting in Monrovia on March 22. Hide Caption 3 of 45 45 photos: The Ebola epidemic Soldiers from the U.S. Army's 101st Airborne Division walk across the tarmac at Campbell Army Airfield before reuniting with their families at a homecoming ceremony March 21 in Fort Campbell, Kentucky. The 162 soldiers were deployed in Liberia, where they helped fight the spread of Ebola. Hide Caption 4 of 45 45 photos: The Ebola epidemic Relatives weep for a loved one who it was believed died from Ebola, at a graveyard on the outskirts of Monrovia on March 11. Hide Caption 5 of 45 45 photos: The Ebola epidemic Doctors Without Borders staffer Alex Eilert Paulsen watches as mattresses and bed frames burn at the Ebola Treatment Unit in Paynesville, Liberia, on January 31. The organization reduced its number of beds from 250 to 30 as gains were made in battling the virus. Hide Caption 6 of 45 45 photos: The Ebola epidemic Pauline Cafferkey, a Scottish woman diagnosed with Ebola, is put on a plane in Glasgow, Scotland, on December 30, 2014. Cafferkey, a 39-year-old nurse who volunteered in Sierra Leone, was being transported to London for treatment. Hide Caption 7 of 45 45 photos: The Ebola epidemic A child who survived the Ebola virus is fed by another survivor at a treatment center on the outskirts of Freetown, Sierra Leone, on November 11, 2014. Hide Caption 8 of 45 45 photos: The Ebola epidemic Health workers in Monrovia cover the body of a man suspected of dying from the Ebola virus on October 31, 2014. Hide Caption 9 of 45 45 photos: The Ebola epidemic Kaci Hickox leaves her home in Fort Kent, Maine, to take a bike ride with her boyfriend on October 30, 2014. Hickox, a nurse, recently returned to the United States from West Africa, where she treated Ebola victims. State authorities wanted her to avoid public places for 21 days -- the virus' incubation period. But Hickox, who twice tested negative for Ebola, said she would defy efforts to keep her quarantined at home. Hide Caption 10 of 45 45 photos: The Ebola epidemic Health officials in Nairobi, Kenya, prepare to screen passengers arriving at the Jomo Kenyatta International Airport on October 28, 2014. Hide Caption 11 of 45 45 photos: The Ebola epidemic U.S. President Barack Obama hugs Ebola survivor Nina Pham in the Oval Office of the White House on October 24, 2014. Pham, one of two Dallas nurses diagnosed with the virus, was declared Ebola-free after being treated at a hospital in Bethesda, Maryland. The other nurse, Amber Vinson (not pictured), was treated in Atlanta and also declared Ebola-free. Hide Caption 12 of 45 45 photos: The Ebola epidemic Health workers in Port Loko, Sierra Leone, transport the body of a person who is suspected to have died of Ebola on October 21, 2014. Hide Caption 13 of 45 45 photos: The Ebola epidemic Health workers bury a body on the outskirts of Monrovia on October 20, 2014. Hide Caption 14 of 45 45 photos: The Ebola epidemic Garteh Korkoryah, center, is comforted during a memorial service for her son, Thomas Eric Duncan, on October 18, 2014, in Salisbury, North Carolina. Duncan, a 42-year-old Liberian citizen, died October 8 in a Dallas hospital. He was in the country to visit his son and his son's mother, and he was the first person in the United States to be diagnosed with Ebola. Hide Caption 15 of 45 45 photos: The Ebola epidemic Boys run from blowing dust as a U.S. military aircraft leaves the construction site of an Ebola treatment center in Tubmanburg, Liberia, on October 15, 2014. Hide Caption 16 of 45 45 photos: The Ebola epidemic Aid workers from the Liberian Medical Renaissance League stage an Ebola awareness event October 15, 2014, in Monrovia. The group performs street dramas throughout Monrovia to educate the public on Ebola symptoms and how to handle people who are infected with the virus. Hide Caption 17 of 45 45 photos: The Ebola epidemic Ebola survivors prepare to leave a Doctors Without Borders treatment center after recovering from the virus in Paynesville, Liberia, on October 12, 2014. Hide Caption 18 of 45 45 photos: The Ebola epidemic A man dressed in protective clothing treats the front porch of a Dallas apartment on October 12, 2014. The apartment is home to one of the two nurses who were diagnosed with Ebola after treating Thomas Eric Duncan, a Liberian national who traveled to Dallas and later died from the virus. Hide Caption 19 of 45 45 photos: The Ebola epidemic A woman crawls toward the body of her sister as a burial team takes her away for cremation October 10, 2014, in Monrovia. The sister had died from Ebola earlier in the morning while trying to walk to a treatment center, according to her relatives. Hide Caption 20 of 45 45 photos: The Ebola epidemic A man digs a grave on October 7, 2014, outside an Ebola treatment center near Gbarnga, Liberia. Hide Caption 21 of 45 45 photos: The Ebola epidemic A person peeks out from the Dallas apartment where Thomas Eric Duncan, the first person diagnosed with the Ebola virus in the United States, was staying on October 3, 2014. Hide Caption 22 of 45 45 photos: The Ebola epidemic A girl cries as community activists approach her outside her Monrovia home on October 2, 2014, a day after her mother was taken to an Ebola ward. Hide Caption 23 of 45 45 photos: The Ebola epidemic A health official uses a thermometer September 29, 2014, to screen a Ukrainian crew member on the deck of a cargo ship at the Apapa port in Lagos, Nigeria. Hide Caption 24 of 45 45 photos: The Ebola epidemic Workers move a building into place as part of a new Ebola treatment center in Monrovia on September 28, 2014. Hide Caption 25 of 45 45 photos: The Ebola epidemic Medics load an Ebola patient onto a plane at Sierra Leone's Freetown-Lungi International Airport on September 22, 2014. Hide Caption 26 of 45 45 photos: The Ebola epidemic A few people are seen in Freetown during a three-day nationwide lockdown on September 21, 2014. In an attempt to curb the spread of the Ebola virus, people in Sierra Leone were told to stay in their homes. Hide Caption 27 of 45 45 photos: The Ebola epidemic Supplies wait to be loaded onto an aircraft at New York's John F. Kennedy International Airport on September 20, 2014. It was the largest single shipment of aid to the Ebola zone to date, and it was coordinated by the Clinton Global Initiative and other U.S. aid organizations. Hide Caption 28 of 45 45 photos: The Ebola epidemic A child stops on a Monrovia street September 12, 2014, to look at a man who is suspected of suffering from Ebola. Hide Caption 29 of 45 45 photos: The Ebola epidemic After an Ebola case was confirmed in Senegal, people load cars with household items as they prepare to cross into Guinea from the border town of Diaobe, Senegal, on September 3, 2014. Hide Caption 30 of 45 45 photos: The Ebola epidemic A health worker wearing a protective suit conducts an Ebola prevention drill at the port in Monrovia on August 29, 2014. Hide Caption 31 of 45 45 photos: The Ebola epidemic A burial team from the Liberian Ministry of Health unloads bodies of Ebola victims onto a funeral pyre at a crematorium in Marshall, Liberia, on August 22, 2014. Hide Caption 32 of 45 45 photos: The Ebola epidemic Dr. Kent Brantly leaves Emory University Hospital on August 21, 2014, after being declared no longer infectious from the Ebola virus. Brantly was one of two American missionaries brought to Emory for treatment of the deadly virus. Hide Caption 33 of 45 45 photos: The Ebola epidemic An Ebola Task Force soldier beats a local resident while enforcing a quarantine on the West Point slum on August 20, 2014. Hide Caption 34 of 45 45 photos: The Ebola epidemic Local residents gather around a very sick Saah Exco, 10, in a back alley of the West Point slum on August 19, 2014. The boy was one of the patients that was pulled out of a holding center for suspected Ebola patients after the facility was overrun and closed by a mob on August 16. A local clinic then refused to treat Saah, according to residents, because of the danger of infection. Although he was never tested for Ebola, Saah's mother and brother died in the holding center. Hide Caption 35 of 45 45 photos: The Ebola epidemic Workers prepare the new Ebola treatment center on August 17, 2014. Hide Caption 36 of 45 45 photos: The Ebola epidemic Liberian police depart after firing shots in the air while trying to protect an Ebola burial team in the West Point slum of Monrovia on August 16, 2014. A crowd of several hundred local residents reportedly drove away the burial team and their police escort. The mob then forced open an Ebola isolation ward and took patients out, saying the Ebola epidemic is a hoax. Hide Caption 37 of 45 45 photos: The Ebola epidemic A health worker disinfects a corpse after a man died in a classroom being used as an Ebola isolation ward August 15, 2014, in Monrovia. Hide Caption 38 of 45 45 photos: The Ebola epidemic Aid worker Nancy Writebol, wearing a protective suit, gets wheeled on a gurney into Emory University Hospital in Atlanta on August 5, 2014. A medical plane flew Writebol from Liberia to the United States after she and her colleague Dr. Kent Brantly were infected with the Ebola virus in the West African country. Hide Caption 39 of 45 45 photos: The Ebola epidemic Members of Doctors Without Borders adjust tents in the isolation area in Kailahun on July 20, 2014. Hide Caption 40 of 45 45 photos: The Ebola epidemic Boots dry in the Ebola treatment center in Kailahun on July 20, 2014. Hide Caption 41 of 45 45 photos: The Ebola epidemic Dr. Jose Rovira of the World Health Organization takes a swab from a suspected Ebola victim in Pendembu, Sierra Leone, on July 18, 2014. Hide Caption 42 of 45 45 photos: The Ebola epidemic Red Cross volunteers disinfect each other with chlorine after removing the body of an Ebola victim from a house in Pendembu on July 18, 2014. Hide Caption 43 of 45 45 photos: The Ebola epidemic A scientist separates blood cells from plasma cells to isolate any Ebola RNA and test for the virus April 3, 2014, at the European Mobile Laboratory in Gueckedou, Guinea. Hide Caption 44 of 45 45 photos: The Ebola epidemic Health specialists work March 31, 2014, at an isolation ward for patients at the facility in southern Guinea. Hide Caption 45 of 45 
 
 Among those who tested negative include are the brother of the deceased; two health workers from a children HIV/AIDS hospital; seven persons from Mpigi Health Center IV; and two relatives of the deceased who participated in the burial. 
 
 "When he felt ill on September 17, he traveled back to Mpigi for treatment since he felt more comfortable with a facility that he had worked with for a long time, a duration the disease was spread," said a statement by health authorities last Sunday. 
 
 Marburg virus was first identified in 1967, when 31 people became sick in Germany and Yugoslavia in an outbreak that was eventually traced back to laboratory monkeys imported from Uganda. Since then the virus has appeared sporadically, with just a dozen outbreaks on record, many -- including the current situation -- involving just a single patient. 
 
 Marburg virus causes symptoms similar to Ebola, beginning with fever and weakness and often leading to internal or external bleeding, organ failure and death. The death rate runs as high as 80 percent, although it was significantly lower in the initial outbreak when patients were cared for in relatively modern, European hospitals. 
 
 The most recent outbreak, also in Uganda, in 2012, killed four out of 15 patients, according to the Centers for Disease Control and Prevention. 
 
 On Tuesday, CDC Director Thomas Frieden pointed to the most recent Marburg case as an example of how a deadly virus could be contained. 
 
 "We've done important work in Uganda to help the Ugandans better have a laboratory network so they can find cases, have a response network with disease detectives who can follow up and have an emergency operations center to trace individual cases," Frieden said. 
 
 The extensive contact tracing included tracking an embalmer back to Kenya, where he was tested and found not to be infected with Marburg. 
 
 "I mention this, because oftentimes in public health, what gets noticed is what happens and it's hard to see what doesn't happen," Frieden continued, noting that there have so far been no additional cases. "That may not make headlines, but it does give us confidence that we can control Ebola in West Africa." ||||| (Adds CDC will send 50 staff to West Africa, statement from Brantly's wife) 
 
 By Rich McKay 
 
 ATLANTA Aug 3 (Reuters) - An American doctor stricken with the deadly Ebola virus while in Liberia and brought to the United States for treatment in a special isolation ward is improving, the top U.S. health official said on Sunday. 
 
 Dr Kent Brantly was able to walk, with help, from an ambulance after he was flown on Saturday to Atlanta, where he is being treated by infectious disease specialists at Emory University Hospital. 
 
 "It's encouraging that he seems to be improving - that's really important - and we're hoping he'll continue to improve," said Dr. Tom Frieden, director of the U.S. Centers for Disease Control and Prevention (CDC) in Atlanta. 
 
 Frieden told CBS's "Face the Nation" it was too soon to predict whether Brantly would survive, and a hospital spokesman said Emory did not expect to provide any updates on the doctor's condition on Sunday. 
 
 Brantly is a 33-year-old father of two young children who works for the North Carolina-based Christian organization, Samaritan's Purse. He was in Liberia responding to the worst Ebola outbreak on record when he contracted the disease. 
 
 Since February, more than 700 people in West Africa have died from Ebola, a hemorrhagic virus with a death rate of up to 90 percent of those infected. The fatality rate in the current epidemic is about 60 percent. 
 
 Frieden told ABC's "This Week" that the CDC was "surging" its response, and that it will send 50 staff to West Africa "to help stop the outbreak in the next 30 days." 
 
 Amber Brantly, Dr. Brantly's wife, said she was able to see her husband on Sunday and he was in good spirits, and that the family is confident he is receiving the very best care. "He thanked everyone for their prayers," she said in a statement. 
 
 A second U.S. aid worker who contracted Ebola alongside Brantly, missionary Nancy Writebol, will be brought to the United States on a later flight as the medical aircraft is equipped to carry only one patient at a time. 
 
 Standard treatment for the disease is to provide supportive care. In Atlanta, doctors will try to maintain blood pressure and support breathing, with a respirator if needed, or provide dialysis if patients experience kidney failure, as some Ebola sufferers do. 
 
 SECOND MISSIONARY EXPECTED SOON 
 
 Writebol, a 59-year-old mother of two who worked to decontaminate those entering and leaving an Ebola isolation unit in Liberia, was due to depart for the United States overnight on Monday, Liberia's information minister said. 
 
 Writebol's husband, David, who had been living and working in Liberia with his wife, was expected to travel home separately in the next few days, their missionary organization, SIM USA, said in a statement. 
 
 Despite public concern over bringing in Ebola patients, the CDC's Frieden said the United States may see a few isolated cases in people who have been traveling, but did not expect widespread Ebola in the country. 
 
 The facility at Emory chosen to treat the two infected Americans was set up with CDC and is one of four in the country with the ability to handle such cases. 
 
 The Americans will be treated primarily by four infectious disease physicians, and will be able to see relatives through a plate-glass window and speak to them by phone or intercom. 
 
 Frieden said it was unlikely Brantly's wife and children, who left Liberia before he began showing symptoms, contracted the disease because people who are exposed to Ebola but not yet sick cannot infect others. 
 
 The CDC has said it is not aware of any Ebola patient having been treated in the United States previously. Five people entered the country in the past decade with either Lassa Fever or Marburg, both hemorrhagic fevers similar to Ebola. 
 
 President Barack Obama has said some participants at an Africa summit in Washington this week would be screened for Ebola exposure. Frieden said on Sunday there was no reason to cancel the event. 
 
 "There are 50 million travelers from around the world that come to the U.S. each year ... We're not going to hermetically seal this country," he told Fox News Sunday. (Additional reporting by Emma Farge in Dakar; Writing by Doina Chiacu and Cynthia Johnston; Editing by Frances Kerry and Sandra Maler) ||||| Story highlights The hospital at the center of the outbreak now has 30 suspected cases, a doctor says 
 
 Concerns over infection ripple across Uganda 
 
 "We do expect the number of suspected cases to increase," the doctor says 
 
 The hospital at the center of an Ebola outbreak in Uganda is now dealing with 30 suspected cases, including five from Kibaale prison, Dr. Dan Kyamanywa said Thursday. 
 
 Three patients at Kagadi hospital have been confirmed as having the virus, said Kyamanywa, a district health officer. 
 
 Doctors are now testing the suspected cases urgently so they can separate confirmed cases from those who do not have the disease, Doctors Without Borders said. 
 
 Suspected cases are still trickling into the hospital, Kyamanywa said. 
 
 At least 16 people have died in the current outbreak. 
 
 The five prisoners have been showing Ebola-like symptoms of vomiting, diarrhea and fever, the doctor said. 
 
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 "We do expect the number of suspected cases to increase," he said. "It's important to break transmission and reduce the number of contacts that suspected cases have." 
 
 There is a fear that the outbreak will spread to the capital, but it is unlikely, he said. 
 
 Many patients fled Kagadi hospital when Ebola was confirmed, he said, and the hospital is struggling to respond to all the call-outs to suspected cases. 
 
 Could the Ebola outbreak spread to the U.S.? 
 
 "Right now there is no treatment for Ebola, so the most effective measure we can take is to contain the spread of the disease," said Olimpia de la Rosa, the Doctors Without Borders emergency coordinator for Uganda Ebola intervention. 
 
 "That is why we need to start working immediately. Other cases need to be rapidly identified because containment is what can stop it," said the expert from the aid group, which is also known as Medecins Sans Frontieres. 
 
 The Ugandan government has asked people in western Uganda to travel by public transport only if it is necessary. 
 
 The outbreak began in the Kibaale district in western Uganda. 
 
 The deaths have stoked heightened fear about the spread of the virus, a highly infectious, often fatal agent spread through direct contact with bodily fluids. Symptoms can include fever, vomiting, diarrhea, abdominal pain, headache, a measles-like rash, red eyes and, at times, bleeding from body openings. 
 
 Market day was canceled Wednesday after Uganda's president warned people not to gather in large groups. 
 
 Health officials urged the public to report any suspected cases, to avoid contact with anyone infected and to wear gloves and masks while disinfecting bedding and clothing of infected people. Officials also advised avoiding public gatherings in the affected district. 
 
 Teams in Uganda are taking an aggressive approach, including trying to track down anyone who came into contact with patients infected with the virus and health workers have been gearing up for better protection of health workers and an influx of cases. 
 
 The workers include people from Uganda's ministry of health, the U.S. Centers for Disease Control and Prevention and the World Health Organization. 
 
 The outbreak initially went undetected because patients did not show typical symptoms, Ugandan Health Minister Dr. Christine Ondoa told CNN on Sunday. Patients had fevers and were vomiting, but did not show other typical symptoms, such as hemorrhaging. 
 
 Diagnosis in an individual who has only recently been infected can be difficult since early symptoms, such as red eyes and skin rash, are seen more frequently in patients who have more common diseases, the CDC said. 
 
 Uganda's Ministry of Health declared the outbreak in Kibaale district Saturday after the Uganda Virus Research Institute identified the disease as the Sudan strain of Ebola hemorrhagic fever. 
 
 The Ebola virus was first detected in 1976 in the central African nation of Zaire (now the Democratic Republic of the Congo). The virus is named after a river in that country. There are five strains of Ebola viruses, all named after the areas where they were found: Zaire, Sudan, Cote d'Ivoire, Bundibugyo and Reston, according to the WHO. 
 
 Ugandan officials, international experts tackle Ebola outbreak ||||| DALLAS (AP) — The first Ebola patient diagnosed in the United States told relatives that he notified health care workers the first time he went to the hospital that he was visiting the U.S. from Liberia, the man's sister said Wednesday. 
 
 An ambulance pulls into the Dallas Fire-Rescue station 37 in Dallas, Wednesday, Oct. 1, 2014. Three EMT's from this location are under a 21 day quarantine after a patient they transported tested positive... (Associated Press) 
 
 This photo taken on Tuesday, Sept. 30, 2014, shows the exterior of Texas Health Presbyterian Hospital in Dallas. An unidentified man, diagnosed with Ebola, has been in isolation at the hospital since... (Associated Press) 
 
 An ambulance pulls into the Dallas Fire-Rescue station 37 in Dallas, Wednesday, Oct. 1, 2014. Three EMT's from this location are under a 21 day quarantine after a patient they transported tested positive... (Associated Press) 
 
 Members of the media stage outside of Texas Health Presbyterian Hospital in Dallas, Wednesday, Oct. 1, 2014. An unidentified man, diagnosed with Ebola, has been in isolation at the hospital since Sunday.(AP... (Associated Press) 
 
 FILE - This undated file image made available by the CDC shows the Ebola Virus. U.S. health officials have warned for months that someone infected with Ebola could unknowingly carry the virus to this... (Associated Press) 
 
 Dr. Edward Goodman, epidemiologist at Texas Health Presbyterian Hospital Dallas, listens to a reporters question during a news conference about an Ebola infected patient at his hospital in Dallas, Tuesday,... (Associated Press) 
 
 The exterior of Dallas Fire-Rescue station 37 in Dallas is shown Wednesday, Oct. 1, 2014. Three EMT's from this location are under a 21 day quarantine after a patient they transported tested positive... (Associated Press) 
 
 Firefighters at Dallas Fire-Rescue station 37 walk in the entrance after pulling in an ambulance in Dallas, Wednesday, Oct. 1, 2014. Three EMT's from this location are under a 21 day quarantine after... (Associated Press) 
 
 People walks up the stairway leading to the Texas Health Presbyterian Hospital in Dallas, Wednesday, Oct. 1, 2014. An unidentified man, diagnosed with Ebola, has been in isolation at the hospital since... (Associated Press) 
 
 Mai Wureh told The Associated Press that her brother, Thomas Eric Duncan, went to a Dallas emergency room on Friday and was sent home with antibiotics. He returned two days later after his condition worsened and was admitted to Texas Health Presbyterian Hospital. 
 
 Dr. Mark Lester confirmed Wednesday that a nurse asked Duncan on his first visit whether he had been in an area affected by the Ebola outbreak that has killed thousands in West Africa, but that "information was not fully communicated throughout the whole team." 
 
 A nine-member group of federal health officials was tracking anyone who had close contact with the man. 
 
 The team from the Centers for Disease Control was in Dallas to work with local and state health agencies to ensure that those people are watched every day for 21 days. 
 
 "If anyone develops fever, we'll immediately isolate them to stop the chain of transmission," Tom Frieden, director of the Centers for Disease Control, said in an interview. 
 
 Duncan has been kept in isolation at the hospital since Sunday. He was listed in serious but stable condition. 
 
 Ebola is believed to have sickened more than 6,500 people in West Africa, and more than 3,000 deaths have been linked to the disease, according to the World Health Organization. 
 
 Officials are monitoring 12 to 18 people who may have been exposed to the man, including three members of the ambulance crew that transported him to the hospital and five schoolchildren. 
 
 Some of the people are members of his family, but not all, Dallas city spokeswoman Sana Syed said. 
 
 The ambulance crew tested negative for the virus and was restricted to home while their conditions are observed. The children, who attend four separate schools, apparently had contact with the man over the weekend and then returned to classes this week. But school officials have said they showed no symptoms. 
 
 Ebola symptoms can include fever, muscle pain, vomiting and bleeding, and can appear as long as 21 days after exposure to the virus. The disease is not contagious until symptoms begin, and it takes close contact with bodily fluids to spread. 
 
 Officials said there are no other suspected cases in Texas, but the diagnosis sent chills through the area's West African community, whose leaders urged caution to prevent spreading the virus. 
 
 The man left Liberia on Sept. 19, arrived the next day to visit relatives and started feeling ill four or five days later, Frieden said. 
 
 Stanley Gaye, president of the Liberian Community Association of Dallas-Fort Worth, said the 10,000-strong Liberian population in North Texas is skeptical of the CDC's assurances because Ebola has ravaged their country. 
 
 "We've been telling people to try to stay away from social gatherings," Gaye said Tuesday at a community meeting. 
 
 The CDC has not advised that people avoid large gatherings in this country. 
 
 The association's vice president warned against alarm in the community. 
 
 "We don't want to get a panic going," said vice president Roseline Sayon. "We embrace those people who are coming forward. Don't let the stigma keep you from getting tested." 
 
 Frieden said he did not believe anyone on the same flights as the patient was at risk. 
 
 The man traveled from the Liberian capital of Monrovia to Brussels and then to Dallas, according to a spokeswoman for the Belgium health ministry, Vinciane Charlier. 
 
 "Ebola doesn't spread before someone gets sick, and he didn't get sick until four days after he got off the airplane," Frieden said. 
 
 Four American aid workers who became infected in West Africa have been flown back to the U.S. for treatment after they became sick. They were treated in special isolation facilities at hospitals in Atlanta and Nebraska. Three have recovered. 
 
 A U.S. doctor exposed to the virus in Sierra Leone is under observation in a similar facility at the National Institutes of Health. 
 
 The U.S. has only four such isolation units, but Frieden said there was no need to move the latest patient because virtually any hospital can provide the proper care and infection control. 
 
 Blood tests by Texas health officials and the CDC separately confirmed his Ebola diagnosis Tuesday. State health officials described the patient as seriously ill. 
 
 Passengers leaving Liberia pass through rigorous screening, the country's airport authority said Wednesday. But those checks are no guarantee that an infected person won't get through and airport officials would be unlikely to stop someone not showing symptoms, according to Binyah Kesselly, chairman of the Liberia Airport Authority's board of directors. 
 
 CDC officials are helping staff at Monrovia's airport, where passengers are screened for signs of infection, including fever, and asked about their travel history. Plastic buckets filled with chlorinated water for hand-washing are present throughout the airport. 
 
 Liberia is one of the three hardest-hit countries in the epidemic, along with Sierra Leone and Guinea. 
 
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 Neergaard reported from Washington. Associated Press writers Nomaan Merchant in Dallas and Emily Schmall in Fort Worth; Jonathan Paye-Layleh in Monrovia, Liberia; Francis Kokutse in Accra, Ghana, and Matt Small of AP Radio, contributed to this report.
– At least 99 people have been quarantined in four different locations in Uganda so far after State House Uganda confirmed a man died this week of the Marburg virus—a type of hemorrhagic fever that's strikingly similar to Ebola, CNN reports. Many of the individuals now in isolation are health workers, as the deceased was a radiographer in a Kampala hospital and another health center and had contact with multiple colleagues. So far 11 of the quarantined have tested negative for Marburg, though they may be retested in a few days if the symptoms they've developed don't disappear. And those symptoms might sound familiar if you've been following the Ebola situation: Both viruses are members of the Filovirus family and manifest in similar ways, including fever, severe headache, and major bleeding, the Washington Post reports. Although many of the outbreaks recorded since Marburg was IDed in 1967 have been single cases, the fatality rate ranges from 23% to 90% (if you discount those single-case years), the CDC notes. Perhaps to mitigate increasing concern over Ebola after Thomas Duncan's death in Texas this week, CDC Director Thomas Frieden has been talking up efforts the CDC has undertaken in Uganda and emphasized that no further Marburg cases have been documented. "That may not make headlines, but it does give us confidence that we can control Ebola in West Africa," he says, per CNN. Dr. Ruhakana Rugunda, Uganda's prime minister, seems to share Frieden's optimism, posting a series of tweets this week that indicate the country's success rate and experience in dealing with hemorrhagic fevers.