Sister Norma Pimentel of RGV Catholic Charities in McAllen says she sees up to 500 migrants a day, and they're not allowed inside the respite center until they've tested negative.

If someone does test positive, however, they’re sent to a hotel.

“There is no public health risk because we're making sure that they don't go anywhere unless they test,” Pimentel said.

READ ALSO: COVID-19 infections in the Valley may be higher than reported  

Catholic Charities has teamed up with the city government to sponsor the COVID-19 tests.

Earlier this week, the Federal Emergency Management Agency told a House subcommittee on Homeland Security that the rate of infection among migrants tested is less than 6 percent, which is lower than the state's overall positivity rate.

The state’s positivity rate is 8.4 percent, according to John Hopkins University.