The next wave of bird flu could be worse than ever
Test finds mutated strain of H7N9 can pass between lab animals through the air
POULTRY PROBLEMS So far, most cases of human H7N9 infection have come from exposure to birds, often in live poultry markets. Here, epidemiologists collect samples at a market in Dongguan, China, in 2014.
CDC/Shuqing Zhao, China