Timeline: May 2004
May
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5
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Two laboratory researchers from National Institute of Virology Laboratory (NIVL) in Beijing who are suspected of SARS did not conduct SARS research; therefore, it is not clear where the source of SARS was from. The laboratory under investigation was closed on April 23 while most of the staff was quarantined.
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May
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19
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Two of the nine cases were direct contacts with the student at NIVL, while the other five were linked as contacts with the nurse.
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