Which virus has caused more widespread epidemics and pandemics than any other in the world?

I got type A influenza November of 2022 and almost died. I've never been that sick in my life horrible horrible

don't you know? a new kid joined the party!

Player #16874511, something's going to get us all in the end

I’ve been a teacher for most of my life. I never get sick.

Rose, i know exactly what ur talking about. i got one of those once. i too thought i was gonna die.

Rose, I don't think I ever fully recovered from it. I was in the ER twice and sick for several months. I dread flu season.