Safety first: Staff members wearing face masks at a workshop in Guangzhou, Guangdong province. — Xinhua
Beijing: Millions of Chinese have begun returning to work, raising public concerns over clusters of Covid-19 (novel coronavirus).
Wu Zunyou, an epidemiologist at the Chinese Centre for Disease Control and Prevention, said at a news conference on Tuesday that a cluster refers to the occurrence of more than two cases in a relatively small unit.
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