The herd-immunity threshold is probably around 20% -- enough to stop exponential growth in cases, but not enough to get the virus to self-extinguish. It also h

The herd-immunity threshold is probably around 20% -- enough to stop exponential growth in cases, but not enough to get the virus to self-extinguish. It also helped when front-line doctors figured out the treatment they were told to use ("invasive ventilation") was a death sentence. They stopped ventilating all their patients, and their patients stopped dying so quickly. The sun also provided progressively more adequate illumination (providing Vitamin D and red light), starting with the vernal equinox on March 20. Covid Season has returned this fall, like clockwork. The only factor that really matters is light exposure. https://www.space.com/vernal-equinox-2020-earliest-spring-124-years.html https://www.space.com/vernal-equinox-2020-earliest-spring-12...