” If you lock people away for an extended period of time, I’d think the strength of their immune systems would drop.”
I would not think a month or two would cause the immune system to drop. The homes are not clean/sterile to cause immune system to drop that quickly. Now public housing in New York is third world and dirty looking.
My dog brings in dirt from outside all the time. People in lock down are going out to get food and ordering take out that brings germs into the house. The wind brings pollen into the house. There is stuff growing in the bathroom or under the house.
After thinking about it, I am not buying being in lock down for two months will lower your immune systems.
Now maybe a person diet during lock down could cause issues:
Let’s face it modern humans have not heard about keeping a good variety of food in the house for hard times. If they are eating Ramen and Noodles daily (coke and chips, pizza take out, etc etc), they just might have some heath issues in lock down. Is that the Lock down fault or the person being a dumb.