Health workers collect nasal swab samples in Hyderabad, India
Xinhua
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A health worker collects nasal swab from a woman for COVID-19 test in Hyderabad, India, on May 9, 2021. (Photos: Xinhua)

A health worker collects nasal swab from a woman for COVID-19 test in Hyderabad, India, on May 9, 2021. (Str/Xinhua)

A health worker collects nasal swab from a woman for COVID-19 test in Hyderabad, India, on May 9, 2021. (Str/Xinhua)

A health worker collects nasal swab from a woman for COVID-19 test in Hyderabad, India, on May 9, 2021. (Str/Xinhua)