Amalia Ayala, front, a resident of Las Brisas Sunset senior apartment complex in San Luis, Ariz., deposits saliva for her COVID-19 test during the ASU and Equality Health Foundation pilot program on Friday, Jan. 15, 2021. Free saliva tests engineered by Arizona State University's Biodesign Institute are administered in Yuma County's small border city of San Luis to disabled and older people living in subsidized housing. The tests have also been given to hundreds of farmworkers. (Cesar Neyoy/The Yuma Sun via AP)
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