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In page 2002–2004 SARS outbreak:

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Two additional confirmed cases of SARS and three additional suspected cases were reported in Beijing on 1 May, all related to a single research lab, the Diarrhea Virus Laboratory in the CDC's National Institute of Virology in Beijing.[1] "The cases had been linked to experiments using live and inactive SARS coronavirus in the CDC's virology and diarrhea institutes where interdisciplinary research on the SARS virus was conducted."[2] The total number of cases was six, with four in Beijing and two in Anhui.[citation needed]