COVID-19 – do masks help?

Executive summary
* The official positions from the World Health Organisation (WHO), the US Centres for Disease Control (CDC), the US Surgeon General and the UK Deputy Chief Medical officer are similar – you don’t need a mask. Some go even further and suggest that wearing a mask may do more harm than good. Others caution that masks should be saved for caregivers.
* A campaign called #Masks4All ha...