In China, a deadly strain of bird flu now easily infects ducks
A vaccine that protects chickens from the virus works in ducks, too
![ducks in China](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/09/092618_TI_bird-flu_feat.jpg?fit=860%2C460&ssl=1)
DUCK FLU Some ducks in China’s Fujian province carry highly pathogenic strains of the H7N9 avian influenza virus. The ducks shown here were photographed on a farm in Fujian province in April 2013, three years before the high pathogenicity strains emerged.
STR/AFP/Getty Images