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 … Continue reading Farce mask: it’s safe for only 20 minutes – The Sydney Morning Herald (2003)