Many Australians could have been infected with Covid-19 for the second, third or even fourth time in the last couple of months. That’s because a new variant of the virus has caused the biggest wave in over a year. But while for many the symptoms are milder, and the risks of serious illness are dropping – what do we need to know about the new variants still emerging? And what evidence do we have about multiple reinfections? Today, applied mathematician, expert in respiratory diseases, and contributor to The Saturday Paper, Dr James Wood, on the latest Covid wave and what could be in store this year.  Socials: Stay in touch with us on Twitter and Instagram Guest: Applied mathematician, expert in respiratory diseases, and contributor to The Saturday Paper, Dr James Wood