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Journal of Clinical Microbiology, June 2003, p. 2727-2733, Vol. 41, No. 6
0095-1137/03/$08.00+0 DOI: 10.1128/JCM.41.6.2727-2733.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
Laboratorio de Hepatitis Virales, Departamento Microbiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina,1 Division of Viral Hepatitis, Centers for Disease Control and Prevention, Atlanta, Georgia2
Received 15 November 2002/ Returned for modification 8 January 2003/ Accepted 25 January 2003
The level of in vitro detection of viral genomes in mixes with two different hepatitis C virus (HCV) subtypes was investigated by artificially mixing previously measured subtype-specific HCV RNA genomes. The RNAs in these mixtures were reverse transcribed and then PCR amplified by using two sets of primers corresponding to the 5' untranslated region and digested with endonucleases to analyze the restriction fragment length polymorphism patterns. This approach facilitated detection of a wider range of type-specific HCV genomes than originally described, beyond equimolar concentrations of contributing HCV subtypes. Moreover, by using computerized image analysis, this study also demonstrated that the true contribution of each virus typeand consequently of mixed infectionsmay be underestimated when only visual observation is carried out. These results may be useful for comparing data obtained from this and other currently used methodologies.
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