On homeless people and the lack of Covid...they basically live their lives out of doors, and in the sunlight. So if you tested them on vitamin D levels....they’d max out. From all of these California videos of the crowd....they all have natural tans, and I think vitamin D is a big part of that story.
Same thing has been said on central Africa...people live their lives primarily in the sun, and vitamin D levels are maxed-out. They also have little to no Covid.
vitamin D from the sun
plus UV rays kill virus within seconds