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1Beijing Genomics Institute, Chinese Academy of Sciences, Beijing 101300, China 2Beijing BGI-GBI Biotech Co. Ltd, Beijing 101300, China 3Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China 4Beijing 302 Hospital, Beijing 100039, China 5Beijing 301 Hospital, Beijing 100853, China 6Beijing Union Hospital, Beijing 100730, China 7Beijing Red Cross Blood Center, Beijing 100088, China
Correspondence Weijun Chen chenweijun72{at}sohu.com, Jian Wang wangjian{at}genomics.org.cn
Received December 18, 2003
Accepted January 8, 2004
To understand the time-course of viraemia and antibody responses to severe acute respiratory syndrome-associated coronavirus (SARS-CoV), RT-PCR and ELISA were used to assay 376 blood samples from 135 SARS patients at various stages of the illness, including samples from patients who were in their early convalescent phase. The results showed that IgM antibodies decreased and became undetectable 11 weeks into the recovery phase. IgG antibodies, however, remained detectable for a period beyond 11 weeks and were found in 100 % of patients in the early convalescent phase. SARS-CoV viraemia mainly appeared 1 week after the onset of illness and then decreased over a period of 1 month, becoming undetectable in the blood samples of the convalescent patients. At the peak of viraemia, viral RNA was detectable in 75 % of blood samples from patients who were clinically diagnosed with SARS 1 or 2 weeks before the test.
These authors contributed equally to this article. Abbreviation: SARS-CoV, severe acute respiratory syndrome-associated coronavirus.
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