Gaining Function. Mosquitos gain function when they draw blood from a host. Covid-19 was man made and gained function because it killed millions of people. It's a little like Dr. Frankenstein bringing life to a corpse. You shouldn't believe a vaccine will eradicate it. It's a curious thing to see how it spread. Other viruses are coming our way, smart viruses that can infect specific populations while leaving others harmless. Natural laws go back a long way and we no longer live in harmony with those laws. We kill our own. We've become too dangerous to ourselves.