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NewsColony ‘How is this possible?’ Researchers grapple with COVID-19’s mysterious mechanism 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.” In these patients, the lungs begin to struggle . Blood pressure lowers. Other organs, including the kidneys, may begin to shut down. Blood clots form throughout the body. The brain and intestines may also be affected. Some suffer changes to their personality, suggesting brain damage. Related: Remdesivir: five Australian hospitals to receive experimental coronavirus drug “I think what is evolving is a very specific set of stages of disease and for some reason, not everyone goes through all...