Cellular immune response to infection by different genotypes of hepatitis C virus

Hepatitis C virus and vaccine development

The prevalence of Hepatitis C virus (HCV) is approximately 3% around the world. This virus causes chronic hepatitis, liver cirrhosis and hepatocellular carcinoma. The effectiveness of interferon-α and ribavirin therapy is about 50% and is associated with significant toxicity and cost. Hence, generating new vaccines or drugs is an obligation. However, there is no vaccine available for clinical use. DNA vaccines have some advantages such as producing feasibility and generating intensive cellular and humoral immune responses. Activation and improvement of natural immune defense mechanisms is a necessity for the development of an effective HCV vaccine. This article discusses the current status of therapies for hepatitis C, the promising new therapies and the experimental strategies to develop an HCV vaccine.

Diversity of genotype and mode of spread of Hepatitis C virus in Northern India

BACKGROUND/AIM

Hepatitis C is caused by hepatitis C virus (HCV), which is classified into 6 genotypes. It leads to chronic hepatitis in 80% of the cases. Genotype of the virus helps in predicting response to antiviral therapy and also the duration of treatment. Therefore, it is important to know the prevalence of each genotype. Knowledge regarding the route of entry of HCV in the blood is also necessary to formulate a strategy to prevent its spread.

PATIENTS AND METHODS

One hundred and two newly diagnosed patients with chronic hepatitis C, having anti-HCV antibody-positive were included in the study. Their HCV RNA viral load and genotype were determined by Reverse Transcriptase PCR assay on Roche Cobas Ampliprep analyzer.

RESULTS

Genotype 3 was commonly detected in 58.8% patients followed by genotype 1 in 20.6%. Twelve patients had genotype 4 (11.8%) and 9 had mixed infection with genotypes 3 and 4. Among these patients, 43.1% of patients had a history of multiple injection exposure. Blood transfusion received by 6.9% and 2.9% had donated blood. Only 1 patient had a history of drug abuse.

CONCLUSION

The distribution of genotypes varies in different regions and therefore its knowledge is important, as it determines the response of the patient to the treatment. The use of autodisabled syringes, their proper disposal, following biomedical waste management guidelines, and organizing continued medical education and workshops will help in preventing the spread of HCV infection.