May 29, 2014 — Because more people are refusing vaccines, measles can spread when people bring it to the U.S. from abroad. That's what's behind the high number of cases this year, with 288 so far.
May 22, 2014 — Most attempts at a malaria vaccine have unsuccessfully tried to keep the parasite from breaking into red blood cells. But a new twist that keeps the parasite from escaping the cells may work better.
May 20, 2014 — Answering health experts' complaints that using vaccination programs for spying had hurt international efforts to fight disease, the CIA says it has stopped the practice.
Apr 25, 2014 — Scientists tracking the ancestry of whooping cough say it arose abruptly in humans about 500 years ago, caused by a mutated bacterium that once lived only in animals. Genetic tricks helped it spread.
Apr 24, 2014 — International travel is one reason why the number of measles cases in the U.S. has spiked this year. But the number of people who refuse to get their children vaccinated is a factor, too.
Apr 18, 2014 — A mumps outbreak in Ohio has ballooned to 234 cases, even though the community is well-protected against the virus. One scientist explains why this "vaccine failure" occurs.
Apr 7, 2014 — A young woman who didn't know she was infected with measles went to a Kings of Leon concert in Seattle. Public health investigators have reconstructed her movements to warn the public.
Apr 6, 2014 — With new measles outbreaks in Southern California, New York and British Columbia, vaccinating — and not vaccinating — is still an area of great concern.
Mar 19, 2014 — Despite evidence to the contrary, many Americans believe cellphones cause cancer and that health officials are covering it up. Discredited theories about vaccines and fluoridation also remain popular.
Mar 17, 2014 — Roughly 1 in 5 unvaccinated people had the flu between 2006 and 2011, but only a quarter of them had symptoms, a study found. That could affect how the virus spreads.