Mode of transmission of hepatitis A is__________?
Correct answer: B. Faeco-oral
- A. Serum
- B. Faeco-oral
- C. Sexual contact
- D. All of these
Explanation
Hepatitis A virus is mainly transmitted by the faeco-oral route, when contaminated food or water carries the virus from faeces into another person's mouth. Sexual transmission can occur in some circumstances, but serum transmission is not the standard route, so “all of these” is too broad for the usual mode of transmission.
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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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