Yeah, that's what I thought as well. Isn't that the reason we need a new flu vaccine every year? Because viruses can mutate and adapt faster than animals can?
I don't know anything about biology so admittedly I'm speaking out of my ass here, but that's certainly what it seemed like to me.
I don't know anything about biology so admittedly I'm speaking out of my ass here, but that's certainly what it seemed like to me.