This effect is well known at scifi/comic/cosplay conventions where it's colloquially called "con flu" or "con plague". I think people would have benefited from

This effect is well known at scifi/comic/cosplay conventions where it's colloquially called "con flu" or "con plague". I think people would have benefited from masking up at any type of those events. But I guess that may not make for the ideal costume photo.