This week, Rasmussen's encephalitis and brain surgery, are packages safe from coronavirus contamination, do blood groups affect Covid-19 risk, why does the SARS-CoV-2 coronavirus appear to spread better in some places than others, what is heart ejection fraction, and how do I disinfect my groceries? Join Dr Chris Smith and Kieno Kammies from 567 Cape Talk, for all the answers... Like this podcast? Please help us by supporting the Naked Scientists