Vaccine against Flu virus? Please, don't count on it, the current vaccines done work.
Lets examine the food chain, bats eat?
Bugs eat? pharmaceuticals/poisons toxins man created...
1917, not enough people killed in world war, what happened?
Flu epidemic?
Thankfully, China has the capability to uncover new viruses...
and capable to produce safety apparel for a global demand.
Littering masks, that's a problem.
Nice day...