Neuroscientist Karl Friston, of University College London, builds mathematical models of human brain function. Lately, he’s been applying his modelling to Covid-19. He says, our approach, which borrows from physics and in particular the work of Richard Feynman, goes under the bonnet. It attempts to capture the mathematical structure of the phenomenon – in this case, the pandemic – and to understand the causes of what is observed.
Wuhan has ordered officials to test its entire population of 11 million people after the central Chinese city where the coronavirus pandemic began reported new infections for the first time since its lockdown was lifted.
South Korean officials on Friday reported 91 patients thought cleared of the new coronavirus had tested positive again, they believe that the virus may have been "reactivated" rather than the patients being re-infected.
Doctors in one hospital in Wuhan found that five of 147 patients in a study tested positive again after recovery. The recovered patients showed no symptoms after testing positive again, and Doctors found no evidence that they became infectious after recovery as their family members tested negative.