...bought them post-SARS, pre-H1N1. Never touched them during H1N1.
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We did that, too. Have used 2 of them this time. Sterilize w/ozone and reuse for retail situations where it isn’t beneficial to argue.
I gave a bunch away to some medical folks and family members, used some similarly. Im doing a 150F sous vide cycle In the Insta-Pot for about an hour, with the masks on the rack above about an inch of water.