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• W2152193720 endingPage "4793" @default.
• W2152193720 startingPage "4781" @default.
• W2152193720 abstract "ABSTRACT The immunological correlates of hepatitis C virus (HCV)-specific immunity are not well understood. Antibodies to HCV structural proteins do not appear to play a key role in clearance of the virus and do not persist after recovery. Here, we studied the kinetics of the cellular immune responses of three HCV-recovered chimpanzees during rechallenge with increasing doses of homologous HCV. Although HCV envelope antibodies remained undetectable throughout the rechallenge, all animals mounted rapid HCV-specific T-cell responses. The pattern of the cellular immune response in blood and liver correlated with the virological outcome. The animal that most rapidly cleared circulating HCV as determined by nested reverse transcription-PCR (RT-PCR) displayed the most vigorous and sustained response of gamma interferon (IFN-γ)-producing and proliferating CD4 + T cells in the blood. Vigorous CD4 + T-cell proliferation during viremia was followed by an increased frequency and a phenotypic and functional change of the tetramer + CD8 + T-cell population. The second animal cleared HCV initially with strong peripheral and intrahepatic CD4 + T-cell responses but experienced low-level HCV recrudescence 12 weeks later, when HCV-specific T cells became undetectable. The third animal maintained minute amounts of circulating HCV, detectable only by nested RT-PCR, in the face of a weak IFN-γ + T-cell response. Collectively, the results suggest protective rather than sterilizing immunity after recovery from hepatitis C. The rate of HCV clearance following reexposure depends on the cellular immune response, the quality and quantity of which may vary among chimpanzees that recovered from HCV infection." @default.
• W2152193720 created "2016-06-24" @default.
• W2152193720 creator A5016433071 @default.
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• W2152193720 date "2003-04-15" @default.
• W2152193720 modified "2023-09-26" @default.
• W2152193720 title "Kinetics of CD4⁺and CD8⁺Memory T-Cell Responses during Hepatitis C Virus Rechallenge of Previously Recovered Chimpanzees" @default.
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• W2152193720 doi "https://doi.org/10.1128/jvi.77.8.4781-4793.2003" @default.
• W2152193720 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/152131" @default.
• W2152193720 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12663785" @default.
• W2152193720 hasPublicationYear "2003" @default.
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