A doctor warns those in the refugee camp in Matamoros, Mexico, about the dangers of Covid-19 on March 18, 2020. Photo by Ivan Flores for Foreign Policy.

A doctor warns those in the refugee camp in Matamoros, Mexico, about the dangers of Covid-19 on March 18, 2020. Photo by Ivan Flores for Foreign Policy.

A doctor warns those in the refugee camp in Matamoros, Mexico, about the dangers of Covid-19 on March 18, 2020. Photo by Ivan Flores for Foreign Policy.