August 26, 2013 Dengue fever was commonplace in Florida until the 1930s. Air conditioning, window screens and better mosquito control helped break the dengue cycle. Now the mosquito-borne illness is back.
August 21, 2013 Just a fragment of genes in bat guano was enough for researchers trying to find out how a deadly new virus spreads. It's the first time the Middle East respiratory syndrome virus has been found in an animal, and offers strong evidence that bats carry the virus.
August 21, 2013 An experimental drug rescued three out of seven monkeys from lethal doses of Ebola. The study marks the first time researchers have shown that a drug can successfully treat Ebola in animals even after the infection is well underway.
August 14, 2013 After suffering dozens of attacks against staff members, including kidnappings and murders, the nonprofit is closing all operations in Somalia. In many parts of the country, the aid group was the only source of health care.
August 12, 2013 A Ugandan who has studied engineering in the U.S. is working to solve medical transportation problems in his homeland. A nonprofit he founded is helping villagers build bicycle ambulances from scrap metal.
August 9, 2013 Scientists find the a tantalizing clue about where people may be catching the Middle East respiratory syndrome. Camels on the Arabian Peninsula and Canary Islands show signs that they've been infected with the virus or a close relative.
August 8, 2013 The proposed studies would essentially create a recipe for a more contagious bird flu. Some scientists worry these viruses could escape the lab and possibly kill millions. But others think the information gleaned from the experiments is critical for keeping H7N9 from becoming a global threat.
August 8, 2013 The bacteria that cause many cases of ear infection in kids and pneumonia in the elderly are usually harmless until activated by distress signals from their human host. When the flu or another virus gives you a fever, for example, mild-mannered pneumococcus can turn nasty.
August 6, 2013 Chinese scientists offer the first clear evidence that the H7N9 bird flu virus can be transmitted from human to human. A father, who became sick in March, passed the virus to his daughter. But the risk of transmission is quite low, and the virus still doesn't appear to pose a global threat.
August 6, 2013 Once the smoke cleared in the casinos of Gilpin County, Colo., after an indoor smoking ban took effect, health researchers documented a sharp drop in the number of emergencies requiring ambulances.
August 2, 2013 In one analysis, economists predict that extreme weather could boost the number of international conflicts by as much as 50 percent by 2050. Higher temperatures might also increase the rates of murder, rapes and domestic violence, they say because aggression seems to rise with the mercury.
August 1, 2013 Acting altruistically rather than selfishly is what makes quarantines successful in stopping disease outbreaks. But an analysis by scientists at MIT finds that commuting patterns also could play a big role in how infectious diseases spread.