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‘Overwhelmed’: COVID-19 testing demand climbing in North Texas ‘Overwhelmed’: COVID-19 testing demand climbing in North Texas More than 64,000 coronavirus tests were conducted in Dallas County in the past week, the most since early February. Medical assistant Sonia Herrera administers a COVID-19 test at YesNoCovid on Tuesday in Dallas.(Elias Valverde II / Staff Photographer) 6:26 PM on Aug 3, 2021 CDT It’s a routine Sonia Herrera has gotten used to since she started working at a COVID-19 testing site in December. She arrives about 8 a.m., puts on a mask and purple gloves and heads o...