'How is this possible?' Researchers grapple with Covid-19's mysterious mechanism

Doctors are still exploring exactly how the coronavirus affects the body, and what its long-term impacts might be

Respiratory physician Dr David Darley says something peculiar happens to a small group of Covid-19 patients on day seven of their symptoms.

Up until the end of that first week, they're stable," says Darley, a doctor with Sydney's St Vincent's Hospital. And then suddenly, they have this hyper-inflammatory response. The proteins involved in that inflammation start circulating in the body at high levels."