In this photo released by Xinhua News Agency, a medical worker collects a swab sample for nucleic acid test in Ruili City of southwest China's Yunnan Province, on July 5, 2021. Authorities in the Chinese city bordering Myanmar locked down the city Wednesday, July 7, shutting most businesses and requiring residents to stay at home, as a fresh outbreak of COVID-19 expanded. (Photo by Wang Guansen/Xinhua via AP Photo)
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