August 19, 2013 Fewer than 30,000 cases of the tick-borne illness are reported each year. But the CDC says surveys of labs that test for the disease, six years of insurance claims and other surveillance methods suggest that the number of infections is actually 10 times higher.
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 1, 2013 When an outbreak of pneumonia sickened 83 Georgia Tech students last fall, campus officials blanketed the campus with information about how to stop the infection's spread. Despite the barrage of information, many students surveyed a month later said they never got the word.
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.
July 31, 2013 In the 1970s, Ali Maow Maalin, a Somali hospital worker, was the last member of the general public to catch smallpox — worldwide. Once recovered, he worked for years to wipe out polio in Somalia. Maalin, called "an inspiration" by world health leaders, died unexpectedly last week.
July 26, 2013 A rare parasite has sickened at least 315 people across 14 states, health officials said. The culprit is cyclospora, a food-borne bug that causes wicked diarrhea. People typically catch the parasite from contaminated produce, but the source of this outbreak is still unknown.
July 23, 2013 Last year, virologists traced the mysterious illness of two Missouri farmers to a virus never seen before. Now, scientists have found the so-called Heartland virus in ticks. The discovery means the U.S. has another tick-borne illness on its hands — and "another reason to avoid getting bit."
July 22, 2013 Scientists are investigating the microscopic world that lives in and on our bodies. It's becoming clear that these tiny companions play a much more complex and important role in human health than thought. But we don't yet know enough about the microbiome to use it to prevent and treat disease.
July 19, 2013 Tuberculosis was once a top killer in the U.S. The disease was such a threat that overcoming it helped lay the groundwork for modern medicine. Now the bacteria are growing resistant to many antibiotics, and some doctors worry TB could rebound.
July 18, 2013 A former aid worker turned his photography hobby into a career after taking pictures of patients in the tuberculosis wards at hospitals in the former Soviet Union. His award-winning photos show inequities in treatment and also glimpses of hope.
July 17, 2013 Public health officials thought West Nile virus was history. But in 2012, the virus struck back, sparking a major outbreak around Dallas that killed 19 people and left hundreds more disabled. Scientists say they've discovered key clues in the Dallas outbreak that could help predict future outbreaks.