For which of the following no preventive vaccine is available?
Correct answer: C. HCV
- A. HAV
- B. HBV
- C. HCV
- D. HEV
Explanation
No routinely available preventive vaccine exists for hepatitis C because HCV has extensive genetic variation and changes its surface antigens, allowing it to evade immune responses. Vaccines are available for HAV and HBV, and an HEV vaccine is available in some countries. Students may choose d because hepatitis E is also commonly discussed as a vaccine-preventable hepatitis.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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