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. 1996 Oct;34(10):2516–2521. doi: 10.1128/jcm.34.10.2516-2521.1996

Comparative study of three methods for genotyping hepatitis C virus strains in samples from Spanish patients.

X Forns 1, M D Maluenda 1, F X López-Labrador 1, S Ampurdanès 1, E Olmedo 1, J Costa 1, P Simmonds 1, J M Sánchez-Tapias 1, M T Jimenez De Anta 1, J Rodés 1
PMCID: PMC229308  PMID: 8880512

Abstract

Hepatitis C virus (HCV) genotypes may be investigated by a variety of laboratory methods that target different parts of the HCV genome and have various degrees of technical difficulty. Since the choice of a particular method is difficult, we compared the performance of (i) a type-specific PCR with type-specific primers from the core region, (ii) molecular hybridization of the PCR-amplified 5' noncoding region to type-specific probes, and (iii) identification of type-specific antibodies against epitopes of nonstructural region 4 by enzyme-linked immunosorbent assay (ELISA). One hundred fifty-one patients with biopsy-proved chronic hepatitis and HCV RNA in serum were investigated. The HCV genotype was identified in 99%, 100%, and 85% of the cases by type-specific PCR, probe hybridization, and ELISA, respectively. The type-specific PCR disclosed infection with type 1a in 3%, type 1b in 74%, and type 3a in 4% of the cases and suggested infection with two or more HCV types, including 2a/2c and 2b, in the remaining 18%. Apparently mixed infections were more prevalent in patients with past intravenous drug use (P < 0.001), but cloning and sequencing of PCR products did not confirm a mixed infection in any of the four cases investigated. Concordant results were obtained by the three procedures with virtually all of the samples in which the type-specific PCR revealed a single HCV genotype. Type-specific hybridization and ELISA usually recognized the genotype producing the strongest DNA band in samples in which type-specific PCR suggested a mixed infection. In conclusion, the three procedures evaluated in this study are reliable for investigation of HCV genotype. Type-specific PCR provides information about HCV subtypes, but a mixed infection detected with this method should be interpreted with caution.

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Selected References

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