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Health department worker Paola Ortiz waits for a chance to be tested for COVID-19, behind the mobile diagnostic tent where the team she works with is conducting daily walk-up testing, in San Gregorio Atlapulco in the Xochimilco district of Mexico City, Friday, July 24, 2020. Ortiz, a health department physiotherapist who has been assigned to interview people waiting in line for the COVID-19 testing, said she began experiencing coronavirus symptoms three days ago, and would herself be tested Friday, with the last of the day's 40 available tests. (Photo by Rebecca Blackwell/AP Photo)
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