Sanctuary cities are full of illegal aliens. They have taken over several urban areas and essentially group themselves in those areas. This suburb has all Guatemalans, this suburb all Somalians, this suburb all Brazilians, this one all Dominiricans, etc. On top of that people chop up houses and triple deckers to maximize revenue and build a crap ton of tiny rooms to rent for all of them. These structures are overly crowded. This situation will not go away and needless to say this new virus or even the next ones that will assuredly come will have no effect.