Masks should be worn by individuals who are sick to prevent infecting others, but the transmissibility of asymptomatic individuals without masks is an open question.

“I would say if someone is sick we have a coffee if they have a fever if they're sneezing or a sore throat they should be wearing a mask when they're out in public question is are people who are asymptomatic having no symptoms how transmissible are they if they don't wear a mask and this is an open question”