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." ||||| 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] ||||| 1967 Germany and Yugoslavia Uganda 31 7 (23%) Simultaneous outbreaks occurred in laboratory workers handling African green monkeys imported from Uganda 1 In addition to the 31 reported cases, an additional primary case was retrospectively serologically diagnosed. 2 
 
 1975 Johannesburg, South Africa Zimbabwe 3 1 (33%) A man with a recent travel history to Zimbabwe was admitted to hospital in South Africa. Infection spread from the man to his traveling companion and a nurse at the hospital. The man died, but both women were given vigorous supportive treatment and eventually recovered. 3 
 
 1980 Kenya Kenya 2 1 (50%) Recent travel history included a visit to Kitum Cave in Kenya's Mount Elgon National Park. Despite specialized care in Nairobi, the male patient died. A doctor who attempted resuscitation developed symptoms 9 days later but recovered. 4 
 
 1987 Kenya Kenya 1 1 (100%) A 15-year-old Danish boy was hospitalized with a 3-day history of headache, malaise, fever, and vomiting. Nine days prior to symptom onset, he had visited Kitum Cave in Mount Elgon National Park. Despite aggressive supportive therapy, the patient died on the 11th day of illness. No further cases were detected. 5 
 
 1990 Russia Russia 1 1 (100%) Laboratory contamination. 6 
 
 1998-2000 Democratic Republic of Congo (DRC) Durba, DRC 154 128 (83%) Most cases occurred in young male workers at a gold mine in Durba, in the north-eastern part of the country, which proved to be the epicentre of the outbreak. Cases were subsequently detected in the neighboring village of Watsa. 7 
 
 2004-2005 Angola Uige Province, Angola 252 227 (90%) Outbreak believed to have begun in Uige Province in October 2004. Most cases detected in other provinces have been linked directly to the outbreak in Uige. 8 
 
 2007 Uganda Lead and gold mine in Kamwenge District, Uganda 4 1 (25%) Small outbreak, with 4 cases in young males working in a mine. To date, there have been no additional cases identified. 9 
 
 2008 USA ex Uganda Cave in Maramagambo forest in Uganda, at the southern edge of Queen Elizabeth National Park 1 0 (0) A U.S traveler returned from Uganda in January 2008. The patient developed illness 4 days after returning, was hospitalized, discharged and fully recovered. The patient was retrospectively diagnosed with Marburg virus infection. 10 
 
 2008 Netherlands ex Uganda Cave in Maramagambo forest in Uganda, at the southern edge of Queen Elizabeth National Park 1 1 (100%) A 40-year-old Dutch woman with a recent history of travel to Uganda was admitted to hospital in the Netherlands. Three days prior to hospitalization, the first symptoms (fever, chills) occurred, followed by rapid clinical deterioration. The woman died on the 10th day of the illness. 11 12 
 
 2012 Uganda Kabale 15 4 (27%) Testing at CDC/UVRI identified a Marburg virus disease outbreak in the districts of Kabale, Ibanda, Mbarara, and Kampala over a 3 week time period. 13 ||||| 4 to 5 family members ordered to stay home 
 
 Thomas Eric Duncan of Liberia was hospitalized in Dallas after being diagnosed with Ebola. (Photo: WFAA) 
 
 DALLAS (AP) — The airline passenger who brought Ebola into the U.S. initially went to a Dallas emergency room last week but was sent home, despite telling a nurse that he had been in disease-ravaged West Africa, the hospital said Wednesday in a disclosure that showed how easily an infection could be missed. 
 
 The decision by Texas Health Presbyterian Hospital to release the patient, who had recently arrived from Liberia, could have put others at risk of exposure to Ebola before the man went back to the ER a couple of days later, when his condition worsened. 
 
 A day after the diagnosis was confirmed, a nine-member team of federal health officials was tracking anyone who had close contact with him after he fell ill on Sept. 24. The group of 12 to 18 people included three members of the ambulance crew that took the man to the hospital and a handful of schoolchildren. 
 
 Related: 5 Dallas ISD students possibly exposed to Ebola 
 
 On Thursday Zach Thompson told WFAA-TV that the man may have come into contact with 80 people. Four to five people are being closely monitored and they have been put under a "control order" to stay inside their home. All of them are close family members. 
 
 No one being interviewed is showing symptoms. The State of Texas sent a release Thursday saying the control order is in place until Oct. 19 when the incubation period is over. 
 
 "That's how we're going to break the chain of transmission, and that's where our focus has to be," Dr. Tom Frieden, director of the Centers for Disease Control and Prevention, told The Associated Press Wednesday. 
 
 The CDC reminded the nation's health care providers to ask patients with symptoms if they've traveled recently. The American College of Emergency Physicians planned to alert its members as well. 
 
 Related: Patient told hospital he was from Liberia, sister says 
 
 The patient explained to a nurse last Thursday that he was visiting the U.S. from Africa, but that information was not widely shared, said Dr. Mark Lester, who works for the hospital's parent company. 
 
 "Regretfully, that information was not fully communicated" throughout the medical team, Lester said. Instead, the man was diagnosed with a low-risk infection and sent home. 
 
 He was prescribed antibiotics, according to his sister, Mai Wureh, who identified her brother, Thomas Eric Duncan, as the infected man in an interview with The Associated Press. 
 
 Duncan has been kept in isolation at the hospital since Sunday. He was listed in serious but stable condition. 
 
 Hospital epidemiologist Dr. Edward Goodman said the patient had a fever and abdominal pain during his first ER visit, not the riskier symptoms of vomiting and diarrhea. 
 
 Map shows the route of Ebola patient Thomas Eric Duncan on his journey from Monrovia, Liberia to Dallas. (Photo: WFAA) 
 
 But the diagnosis, and the hospital's slip-up, highlighted the wider threat of Ebola, even in places far from West Africa. 
 
 "The scrutiny just needs to be higher now," said Dr. Rade Vukmir, a spokesman for the American College of Emergency Physicians. 
 
 Ebola is believed to have sickened more than 7,100 people in West Africa and killed more than 3,300, according to the World Health Organization. Liberia is one of the three hardest-hit countries in the epidemic, along with Sierra Leone and Guinea. 
 
 In Texas, neither the ambulance crew nor the children showed any symptoms. They were restricted to home while their conditions are observed. It was not exactly clear how Duncan knew the children, but his sister said he had been visiting with family, including two nephews. 
 
 At an address listed for the family in Kannapolis, North Carolina, a man who identified himself as Duncan's brother told reporters the family was "just stressed out." 
 
 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. It spreads only by close contact with a patient's bodily fluids. 
 
 Ebola patient's route 
 
 Map shows the route of Ebola patient Thomas Eric Duncan on his journey from Monrovia, Liberia to Dallas.(Photo: WFAA) 
 
 The man left Liberia on Sept. 19, flying from Brussels to Dulles Airport near Washington. He then boarded a flight for Dallas-Fort Worth, according to airlines, and arrived the next day to see relatives. 
 
 He started feeling ill four or five days later, Frieden said. 
 
 Related: Dallas parents concerned about exposure 
 
 The CDC sent a team to Monrovia's airport on Wednesday to make sure health officials there are screening passengers properly. All people traveling from the outbreak zone are supposed to be checked for fever and asked about their travel history before being allowed to leave. Plastic buckets filled with chlorinated water for hand-washing are present throughout the airport. 
 
 "There were no signs of any disease when the gentleman boarded the flight," said Dr. Tom Kenyon, director of the CDC's Center for Global Health. "This was not a failure of the screening process at the airport." 
 
 Since the man was showing no symptoms on the plane, the CDC stressed that there is no risk to fellow passengers. 
 
 Tests designed to detect the virus in the bloodstream are not typically performed on people who don't yet have symptoms, because tests done too early may miss the diagnosis, Frieden said. 
 
 "Even in the initial phases of illness, when they've got a fever, the most sensitive tests in the world don't detect it because there's so little virus that they have," he said. "It's only as they become sicker that they become more infectious." 
 
 Hospitals have been on the lookout: The CDC has received 94 inquiries from states about illnesses that initially were suspected to be Ebola, but after taking travel histories and doing some other work, most were ruled out. Of the 13 people who actually underwent testing, only one — the Dallas patient — tested positive. 
 
 The Dallas apartment complex where Duncan was believed to be staying was cordoned off Wednesday, and the management was turning away visitors. TV cameras lined the fence of the parking lot, and at least one helicopter hovered overhead. 
 
 Four American aid workers who became infected in West Africa have been flown back to the U.S. for treatment after they became sick. Three have recovered. 
 
 ___ 
 
 Neergaard reported from Washington. Associated Press writers Nomaan Merchant in Dallas and Emily Schmall in Fort Worth; Jonathan Paye-Layleh in Monrovia, Liberia; Juergen Baetz in Brussels; Matt Small in Washington, D.C.; and researcher Rhonda Shafner in New York contributed to this report. 
 
 Read or Share this story: http://www.khou.com/story/news/local/texas/2014/10/02/ebola-infected-man-may-have-been-in-contact-with-80-people/16575081/ ||||| DALLAS Four people close to the first person diagnosed with Ebola in the United States were quarantined in a Dallas apartment where sheets and other items used by the man were sealed in plastic bags as health officials widened their search for people who had direct or indirect contact with him. 
 
 Health officials said on Thursday that 12 to 18 people had direct contact with Thomas Eric Duncan, who flew to Texas from Liberia via Brussels and Washington two weeks ago, and they in turn had contact with scores of others. 
 
 Up to 100 people have been contacted and a handful were being monitored, said Dr. Thomas Frieden, director of the U.S. Centers for Disease Control and Prevention (CDC). 
 
 None of those thought to have had contact with the patient were showing symptoms of Ebola, Dallas County officials said at a news conference. Duncan had been staying in an apartment in the northeastern part of the city for about a week before going to a Dallas hospital. 
 
 "The sheets were placed in a sealed plastic bag and have been in the bag, as well as the belongings of Mr. Duncan, those were also in a bag," said Clay Jenkins, Dallas County's top political official. 
 
 In Liberia, the head of the country's airport authority, Binyah Kesselly, said the government could prosecute Duncan for denying he had contact with someone who was eventually diagnosed with Ebola. 
 
 The government said Duncan failed to declare that he helped neighbor Marthalene Williams after she fell critically ill on Sept. 15. Williams died. 
 
 Kesselly said Duncan was asked in a questionnaire whether he had come in contact with any Ebola victim or was showing any symptoms. "To all of these questions, Mr. Duncan answered 'no,'" Kesselly said. 
 
 Ebola can cause fever, bleeding, vomiting and diarrhea and spreads through contact with bodily fluids such as blood or saliva. Duncan's case put U.S. health authorities and the public on alert over concern for the potential of the virus to spread from Liberia and two other impoverished West African countries, Guinea and Sierra Leone. The virus has killed at least 3,338 people in the worst such outbreak since the disease was identified in 1976. 
 
 President Barack Obama called Dallas Mayor Mike Rawlings on Thursday and "pledged federal agencies will remain in close coordination and reiterated his confidence in America's doctors and national health infrastructure to handle this case safely and effectively," White House spokesman Eric Schultz said. 
 
 Officials have said the U.S. healthcare system is well prepared to contain the hemorrhagic fever's spread by careful tracking of those who have had contact with Duncan, and employing appropriate care. 
 
 Dallas County officials said the problem was very localized. "When I say local, I don’t mean Dallas. I mean a very specific neighborhood in the northeast part of Dallas," Dallas Mayor Rawlings told reporters. 
 
 HOSPITAL SENT PATIENT AWAY 
 
 Duncan initially sought treatment at Texas Health Presbyterian Hospital on the night of Sept. 25 but was sent back to the apartment, with antibiotics, despite telling a nurse he had just been in Liberia. By Sunday, he needed an ambulance to return to the same hospital after vomiting on the ground outside the apartment complex. 
 
 He was in serious condition on Thursday, no change from Wednesday, a hospital spokeswoman said. 
 
 Police and armed security guards were keeping people about 100 yards (meters) away from the apartment, with orange cones blocking the entrance and exit. Maintenance workers scrubbed the parking lot with high-pressure water and bleach. 
 
 Dr. David Lakey, commissioner of the Texas Department of State Health Services, said the four people under quarantine did not have a fever and were healthy. 
 
 Lakey said monitoring included fever checks twice a day. At the apartment, "there is a law enforcement person there in case individuals leave," Lakey told reporters on a conference call. 
 
 U.S. officials initially described the number of people potentially exposed as a handful, and on Wednesday said it was up to 18. Then on Thursday, the Texas health department said there were about 100 potential contacts. 
 
 CNN reported that a Dallas woman who had a child with Duncan said he had sweated profusely in the bed they shared at her apartment. The woman, whom CNN identified only as "Louisa," is quarantined in the apartment with one of her children, who is 13, and two visiting nephews in their 20s. 
 
 They were all in the home when Duncan began showing signs of illness, the report said. The woman said she mentioned twice to hospital staff that he had come from Liberia. 
 
 Dr. Amesh Adalja, an infectious disease physician at the University of Pittsburgh, said contact tracing is “bread-and-butter public health," and something health officials do regularly to track tuberculosis, measles and sexually transmitted diseases. 
 
 Adalja said the most disturbing part of the U.S. incident is that Duncan was sent home from the hospital with antibiotics. 
 
 “This really is something that shouldn’t have happened,” he said. “It just reinforces that taking a travel history has to be an essential part of taking care of patients." 
 
 (Reporting by Susan Heavey, Doina Chiacu and Toni Clarke in Washington, Colleen Jenkins in Winston-Salem, North Carolina, Jon Herskovitz in Austin, Lisa Maria Garza and Marice Richter in Dallas, Jim Forsyth in San Antonio and Brendan O'Brien in Milwaukee; Felix Bate in West Africa; Writing by Jim Loney and Grant McCool; Editing by Bernadette Baum, Jonathan Oatis and Lisa Shumaker)
– 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.