Our immune system handles most viruses. If it doesn't we can just develop a vaccine. Keep in mind that evolution has spend the entirety of time the human speci

Our immune system handles most viruses. If it doesn't we can just develop a vaccine. Keep in mind that evolution has spend the entirety of time the human species has existed trying to evolve a virus that is effective against human targets. Our immune system is very capable of handling larger infections in 99.99% of cases a virus takes hold in our bodies. And for the remainder we have modern science like vaccines and anti-virals.