“When communities have very solid social umbrellas, covid is not going to make much headway,” said David E. Hayes-Bautista, director of the Center for the Study of Latino Health and Culture at UCLA’s David Geffen School of Medicine. “But when you get communities that have great big, gaping holes — lack of health insurance, lack of providers, have to be out and exposed, low-income — covid is just going to go right through there.”