Professor Cossart said that could take as little as 15 or 20 minutes, after which the mask would need to be changed. But those warnings haven’t stopped people snapping up the masks, with retailers reporting they are having trouble keeping up with demand.
[John Bell from the Pharmaceutical Society of Australia] agreed with Professor Cossart’s assessment regarding the effectiveness of the masks.
“I think they’re of marginal benefit,” he said. “In a way they give some comfort to people who think they’re doing as much as they can do to prevent the infection.”