Three genetic changes could be enough to make a bird flu strain that's already killing some people in China highly contagious. Are experiments with a deliberately mutated version too risky?
China has seen an uptick of cases of the deadly H7N9 strain of the avian flu virus, and authorities are trying to stop it from spreading further. Some areas are closing live poultry markets.
Scientists are convening to debate whether experiments that make some viruses more contagious in order to advance understanding of potential outbreaks are worth the risk of creating one.
The largest outbreak of avian flu in U.S. history is ravaging poultry at farms in the Midwest. Sec. Tom Vilsack says there's no risk of transmission to humans, but egg prices may rise.
This is the worst outbreak since the H5N2 influenza was first detected in December. The disease has been found in seven other states over the past five months.
A flu strain deadly to chickens and turkeys is striking farms in the West and Midwest. This week, it hit an Iowa facility with millions of egg-laying hens. No one knows how it's entering houses.
Scientists are deeply divided on whether lab-made flu viruses are legitimate medical research or national security threats. A new federal policy asks institutions to evaluate those risks early on.
The sloppy handling by federal scientists of the world's scariest germs must stop, says the dismayed head of the Centers for Disease Control and Prevention. Are his new rules enough?