In this Tuesday, March 3, 2020 photo, homeless people crowd a sidewalk in downtown Salem, Ore., where they have set up a makeshift camp. Experts say that the homeless, who often have health and substance-abuse problems, are exposed to the elements and do not have easy access to hygiene, are more vulnerable to the coronavirus. Some cities are making provisions so the homeless who contract the virus have a place to recover without spreading the infection further. (AP Photo/Andrew Selsky)