why is pcb a health concern for humans?
PCBs are a probable human carcinogen. Studies of PCBs in humans have found increased rates of melanomas, liver cancer, gall bladder cancer, biliary tract cancer, gastrointestinal tract cancer, and brain cancer, [1] and may be linked to breast cancer. PCBs are known to cause a variety of types of cancer in rats, mice, and other study animals. [2].
Pneumocystis pneumonia (PCP) is a serious infection that causes inflammation and fluid buildup in the lungs. It is caused by a fungus called Pneumocystis jiroveci. Likely spread through the air, this fungus is very common.Most people are exposed to it by age 3 or 4.A healthy immune system can easily control it. About 9% of patients with HIV/AIDS who are hospitalized have PCP. 2  PCP is still a major cause of death in AIDS patients in the United States. 3  The mortality rate is between 5% and 40%, even with treatment. 4  PCP is a highly treatable and preventable infection.