Hepatitis C cross-genotype immunity and implications for vaccine development

While about a quarter of individuals clear their primary hepatitis C (HCV) infections spontaneously, clearance (spontaneous or treatment-induced) does not confer sterilizing immunity against a future infection. Since successful treatment does not prevent future infections either, an effective vaccin...

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Veröffentlicht in:Scientific reports 2017-09, Vol.7 (1), p.12326-8, Article 12326
Hauptverfasser: Islam, Nazrul, Krajden, Mel, Shoveller, Jean, Gustafson, Paul, Gilbert, Mark, Wong, Jason, Tyndall, Mark W., Janjua, Naveed Zafar
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container_title Scientific reports
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creator Islam, Nazrul
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Janjua, Naveed Zafar
description While about a quarter of individuals clear their primary hepatitis C (HCV) infections spontaneously, clearance (spontaneous or treatment-induced) does not confer sterilizing immunity against a future infection. Since successful treatment does not prevent future infections either, an effective vaccine is highly desirable in preventing HCV (re)infection. However, development of an effective vaccine has been complicated by the diversity of HCV genotypes, and complexities in HCV immunological responses. Smaller studies on humans and chimpanzees reported seemingly opposing results regarding cross-neutralizing antibodies. We report a lack of cross-genotype immunity in the largest cohort of people to date. In the adjusted Cox proportional hazards model, reinfection with a heterologous HCV genotype (adjusted Hazard Ratio [aHR]: 0.45, 95% CI: 0.25–0.84) was associated with a 55% lower likelihood of re-clearance. Among those who cleared their first infection spontaneously, the likelihood of re-clearance was 49% lower (aHR: 0.51, 95% CI: 0.27–0.94) when reinfected with a heterologous HCV genotype. These findings indicate that immunity against a particular HCV genotype does not offer expanded immunity to protect against subsequent infections with a different HCV genotype. A prophylactic HCV vaccine boosted with multiple HCV genotype may offer a broader and more effective protection.
doi_str_mv 10.1038/s41598-017-10190-8
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Since successful treatment does not prevent future infections either, an effective vaccine is highly desirable in preventing HCV (re)infection. However, development of an effective vaccine has been complicated by the diversity of HCV genotypes, and complexities in HCV immunological responses. Smaller studies on humans and chimpanzees reported seemingly opposing results regarding cross-neutralizing antibodies. We report a lack of cross-genotype immunity in the largest cohort of people to date. In the adjusted Cox proportional hazards model, reinfection with a heterologous HCV genotype (adjusted Hazard Ratio [aHR]: 0.45, 95% CI: 0.25–0.84) was associated with a 55% lower likelihood of re-clearance. Among those who cleared their first infection spontaneously, the likelihood of re-clearance was 49% lower (aHR: 0.51, 95% CI: 0.27–0.94) when reinfected with a heterologous HCV genotype. These findings indicate that immunity against a particular HCV genotype does not offer expanded immunity to protect against subsequent infections with a different HCV genotype. 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subjects 692/308/174
692/699/255/234/2513/1551
Adult
Antibodies, Neutralizing - blood
Antibodies, Neutralizing - immunology
Cohort Studies
Cross Protection - genetics
Cross Protection - immunology
Female
Genotype
Genotype & phenotype
Genotypes
Hepacivirus - genetics
Hepacivirus - immunology
Hepatitis
Hepatitis C
Hepatitis C - blood
Hepatitis C - immunology
Hepatitis C - prevention & control
Hepatitis C - virology
Hepatitis C Antibodies - blood
Hepatitis C Antibodies - immunology
Humanities and Social Sciences
Humans
Immunity
Immunization, Secondary - methods
Infections
Male
Middle Aged
multidisciplinary
Science
Science (multidisciplinary)
Treatment Outcome
Vaccination - methods
Vaccine development
Vaccines
Viral Envelope Proteins - genetics
Viral Envelope Proteins - immunology
Viral Hepatitis Vaccines - genetics
Viral Hepatitis Vaccines - immunology
Viral Hepatitis Vaccines - therapeutic use
title Hepatitis C cross-genotype immunity and implications for vaccine development
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