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. 2004 Feb;189(4):652–657. doi: 10.1086/381207

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© 2004 by the Infectious Diseases Society of America

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure 1. — Virus quantity expressed as relative units (RU) of human coronavirus (HCoV) that could be detected in the clinical specimens (n = 14). ◯, Clinical specimens tested by Taqman-based real-time polymerase chain reaction (PCR) only; □, clinical specimens tested by both the in-house nested PCR and the Taqman-based real-time PCR.