Viruses! They're fantastic! But not as fantastic as the music I'm listening to right now, but ahem. Viruses.
Viruses can kill all of humankind if we don't have a reproductive system. They can. And they will. They have a plan. They will get better at it. Who will triumph? Us, or viruses? Probably us, but guys, do you think viruses will adapt to everything we throw at them? Think about it.
We have high chances of surviving against viruses with our current tech.
Have you gotten your flu vaccines yet? You should. You will need that. Think about the vaccine as a syringe putting little target practice things into your body, telling the cells that "THESE ARE THE ENEMY. THEY ARE TOP PRIORITY. IGNORE THEM AND WE WILL POSSIBLY DIE." It's like an army sergeant. TEN HUT SOLDIERS, WE ARE GOING TO KILL THOSE FLU VIRUSES BECAUSE THEY WILL KILL US IF WE DO NOT! AM I CLEAR MARINES! Sir Yes Sir! THEN DAMN RIGHT I AM. NOW RALLY UP! ITS GO TIME!