NEW DELHI, INDIA JULY 17: A health worker in PPE coveralls collects swab sample from a man for Covid-19 rapid antigen testing at a government dispensary, in Mehrauli, on July 17, 2020 in New Delhi, ...
July 25 (UPI) --Scientists at Columbia University unveiled research Monday they said is "a step closer" toward bringing polymerase chain reaction, known as PCR, testing for COVID-19 and other viruses ...
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