Dr Chris Smith, consultant virologist at Cambridge University and one of BBC Radio 5 Live's Naked Scientists, is back, with the latest info on COVID-19, and practical advice to help us manage the risks associated with it. Among the subjects up for discussion: how effective are travel bans as a way of containing the virus, why Italy has been so hard hit, why children don't seem to be getting sick, and the influence of the weather on its future spread.