These migrant families walked north for safety. Now they face coronavirus.

More than a year later, the coronavirus pandemic has sealed the borders these groups once crossed. Some wait for asylum in the U.S. or in Mexico; many work on the fringes of the informal economy. The virus has frozen their applications, and with it, their futures. The cramped camps where they live are said to be on the brink of humanitarian disaster as COVID-19 cases appear.