The flu has been around since at least 1918.
And masks don’t work against flu either.
Yes, the Spanish Flu Epidemic, but I was talking about the fact that the flu has been around for ages, and been severe in more years than just 1918+, yet it's only now that they are recommending masks. In 1918, masks were ordered worn in October and November, and ended just before the Armistice. When San Francisco tried to introduce another mask order, it met very high resistance. Mask orders in the 21st Century is pure fear-mongering.