However it began, the advantage China and other Asian countries had was that they realised the threat. Aylward said many countries in the west still haven't understood. China's concern, having experienced Sars, was serious virus; the west's was serious disease. And that, for him, is why they have not ended their epidemics. If the west has 1,000 cases, it will put the 100 that are severe in hospital. "The other 900 – nobody has any idea where they are, I mean, you can't win that way," he said. "The huge difference was just that extraordinary effort ensuring that they effectively isolated all moderate or mild cases."
Regardless of where it came from – or blame – the only way to tackle a novel virus is to take it incredibly seriously. "China saw it as a serious virus from day one," Aylward said.