Why experts warn not to wear a face mask with a valve
It will be mandatory to wear a face mask in England in shops and supermarkets from Friday, July 24.It was also previously made compulsory for passengers on public transport to wear coverings from June 15.The new lockdown laws follow research into the effectiveness of wearing face masks as a precaution against coronavirus, however experts have warned that wearing one with a valve can be counterproductive.Earlier this month, Dr Bharat Pankhania, who has more than 20 years experience in infectious disease management, urged people to stop wearing masks with valves in them as they force a "high velocity flow of air from the mouth out through the valve which could create a plume of infection."Speaking to LBC, the doctor stressed: “We must not