As UK cases spike again, Dr Chris Smith joins RNZ's Kim Hill to discuss why some geographies are particularly hard-hit, what constitutes a "super-spreader" and who are the asymptomatic cases, what sentinel screening is telling us about the features and spread of Covid-19. Also on the table, low-cost rapid testing technology, the prospect of using testing to return the airline industry to viability, the timelines for vaccines, and why the Neanderthal in you might affect your coronavirus risk... Like this podcast? Please help us by supporting the Naked Scientists