Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2005 Jun 15;40(12):1721–1729. doi: 10.1086/430301

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2005 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.

PMC Copyright notice

Correlation of human coronavirus NL63 (HCoV-NL63) load and duration of illness. Patients with multiple respiratory pathogens are excluded from this analysis. Viral load is expressed as genome copies per reaction, and 1 genome copy per reaction approximates to 326 copies per 1 mL of nasopharyngeal aspirate (NPA) material. The viral load appears to correlate inversely with time after onset of clinical symptoms, withr = -0.8 (by Pearson Correlation coefficient). The equation log₁₀ (viral load) = -1.09 (day) + 4.96 was found to predict HCoV-NL63 load in the NPA specimen in relation to symptom onset.