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A staff checks the nucleic acid test kit at the plant of Luoyang Ascend Biotechnology Co., Ltd in Luoyang, central China's Henan Province, March 4, 2020. (Xinhua/Li Jianan)

A staff checks the nucleic acid test kit at the plant of Luoyang Ascend Biotechnology Co., Ltd in Luoyang, central China's Henan Province, March 4, 2020. (Xinhua/Li Jianan)