How Sunlight, the Immune System, and Covid-19 Interact? br br --bl-- br br There seems to be a correlation between states that get a lot of sun and lower rates of death. br br There are probably several pathways by which sunlight and sun exposure may exert beneficial effects. br br As we were reading the literature on other viruses — particularly SARS, the earlier coronavirus br br there were indications that UV light could at least inactivate the virus on surfaces and could also either decrease the risk of getting the virus or reduce symptoms, br br The benefits of sunlight may extend beyond its ability to slay Covid-19 outside the body. br br --bl-- br br When people are exposed to UV light, this may cause changes inside the human body that both strengthen the immune system and block Covid-19 from replicating and causing severe illness.