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A health worker takes a nasal swab sample from a migrant from Indian state Maharashtra for rapid antigen test for possible COVID-19 infection at a railway station in Patna, the capital city of India's eastern state of Bihar, on April 19, 2021. India's COVID-19 tally surpassed the 15-million mark, reaching 15,061,919, on Monday, revealed the latest data released by the federal health ministry. (UNI via Xinhua)