They aren't 99% effective against the flu. They might not be effective at all for the flu. Pre-covid studies were mixed as best, but many found that asymptoma

They aren't 99% effective against the flu. They might not be effective at all for the flu. Pre-covid studies were mixed as best, but many found that asymptomatic mask wearing wasn't significantly effective at reducing flu infections. You are really only contagious with the flu for a day before symptoms show up (and even then you aren't that contagious until the symptoms get worse). We'd eliminate the flu spreading by just self-quarantining after the onset of flu symptoms + wearing a mask when sick to go essential things like showing for essentials or going to the drug store. I would have thought we learned something from the pandemic about staying home when sick. But when my wife's work found out she had covid symptoms it was STAY HOME. But the tests confirmed it wasn't covid--just a cold--COME IN. Now the whole office has a cold. They learned nothing.