France is facing its worst bird flu crisis in history as a rare rebound in outbreaks of the highly contagious virus reached the country’s largest poultry producing regions with cullings topping more than 12 million birds.

Scientists are scrambling to find the cause for the sudden spike in human cases of avian influenza A (H5N6) in China to 21 during year-to-date 2021, from only five in 2020, reports say.

The first human case of a new strain of avian flu was diagnosed in China in late May. Chinese health authorities say there is a low risk of contagion. After China notoriously underreported COVID-19 mortality, can this new assurance be trusted?