What previous bird flu outbreaks teach us

Researchers at ETH Zurich have analysed the bird flu epidemic caused by the H7N9 strain that affected China from 2013 to 2017. New phylogenetic trees will help to improve monitoring of future bird flu epidemics.

Picture from a market in China where chickens sit tightly crammed in a cage.
In China, live poultry is commonly sold at markets. Sick animals not only infect other birds but can also transmit diseases to humans. (Photograph: Adobe Stock)

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