In this May 26, 2020, file photo, Nevada National Guard soldier PFC Nikolas Herrera places used …

In this May 26, 2020, file photo, Nevada National Guard soldier PFC Nikolas Herrera places used swab into the solution tube during a demonstration at a COVID-19 testing site in Las Vegas. (L.E. Baskow/Las Vegas Review-Journal) @Left_Eye_Images