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Previous Volume 350:1366-1367 March 25, 2004 Number 13 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Quasispecies are known in RNA viruses such as hepatitis C virus and human immunodeficiency virus.¹ Owing to poor fidelity of RNA polymerases, RNA-virus populations typically contain genetic variants that form a heterogeneous virus pool. The severe acute respiratory syndrome (SARS)–associated coronavirus, as a newly identified RNA virus,² however, has been reported with relatively limited variations,^3,4 and no published data have recorded the existence of quasispecies.

During the SARS outbreak from March to June in 2003, 132 patients with SARS were treated in our unit, including those with the first cluster of cases in the Beijing, China, area.⁵ . . . [Full Text of this Article]

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• Ma, Y., Feng, Y., Liu, D., Gao, G. F. (2009). Avian influenza virus, Streptococcus suis serotype 2, severe acute respiratory syndrome-coronavirus and beyond: molecular epidemiology, ecology and the situation in China. Phil Trans R Soc B 364: 2725-2737 [Abstract] [Full Text]