They are getting it. At least in Toronto, the folks in shelters were contracting it higher numbers than average. Small tent cities started to pop up in parks so they could spread out. But in general, they are not a target demographic so the news ignores them. They are less likely to go to the doctor or hospital. And they are more likely to die at an earlier age. In places where the social safety net is sparse, there will probably be a higher death rate.
Maybe in Africa, they care for each other more.