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February 10, 2013 Chagas' disease, which is transmitted by the "kissing bug," occurs mainly in Latin America. But the illness is on the rise in the U.S. Health economists now estimate that Chagas costs the world about $7 billion annually, which is more than the cost of cervical cancer or cholera.

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January 31, 2013 There have been 20 reports of human salmonella infections linked to pet hedgehogs recently. Public health officials say people should keep the animals away from areas where food is prepared and served.

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January 23, 2013 After researchers created versions of the bird flu virus that could spread more easily, critics began to worry that the work could spawn a pandemic if a virus escaped from the lab. After halting their work for more than a year, scientists now say the benefits outweigh the risks, and they are set to restart their experiments.

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January 19, 2013 After a decades-long campaign, Guinea worm remains in only four countries, and eradication is in sight. But health workers say that recent violence in Mali is hindering efforts to stamp out the last few cases there.

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January 17, 2013 Flu viruses hijack the machinery inside animal cells to replicate. The theft is a complicated process that takes time. If the virus leaves the cells too early or too late, the risk of infection falls.

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January 17, 2013 In many parts of the world, like Europe, the plague is thought to have been eliminated. French scientists find evidence that the stubborn bacteria can trigger new outbreaks even after decades of apparent dormancy.

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January 16, 2013 Canadian scientists have developed a synthetic stool that successfully treated two patients with a severe form of diarrhea. The researchers call the concoction RePOOPulate, and they produce it using a machine that recreates conditions in the colon.

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January 14, 2013 People expect coughs to last about half as long as they actually do. This misconception may lead patients to ask their doctors for antibiotics to treat cases of bronchitis that would go away without treatment.

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January 11, 2013 The flu season may be easing up in some parts of the country, but it's far too soon to let you guard down. The Centers for Disease Control and Prevention says influenza infections ebb and flow unpredictably.

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January 8, 2013 Superstrains of gonorrhea, which are resistant to all antibiotics, have cropped up in Europe and Asia. Now Canadian doctors report the first failure in North America of the usual antibiotic for gonorrhea, leaving just one drug left to fight the sexually transmitted germ.

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January 4, 2013 Developed by British researchers, Larry the robot has helped scientists see that a little vomit can go a long way. He vomits on command. And his barf can be tagged with fluorescent dye that makes it easy for scientists to track.

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December 19, 2012 Scientists recently sparked controversy when they made dangerous new forms of bird flu. The National Institutes of Health is about to put in place a new system for reviewing this kind of work in the future.

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December 17, 2012 Gin, Jesuit priests, communist bravado — the history of malaria is littered with strange bedfellows, as our video shows. The parasite has proved to be a wily foe, frustrating human efforts to control it time and time again.

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December 10, 2012 About 10 years ago, some nasty bacteria became impervious to some common classes of antibiotics. Scientists have sequenced genome samples of this superbug from all over the world. The results helped them figured out how it emerged in the U.S. and then moved to Europe, Australia and Asia.

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December 5, 2012 To raise vaccination rates, some states have made it much harder for parents to get exemptions for their children from immunizations based on personal beliefs. One doctor says restrictions could backfire.

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