Which of the following body fluids is NOT normally an effective vehicle for transmitting HIV?
Correct answer: B. Saliva
- A. Blood
- B. Saliva
- C. Semen
- D. Vaginal secretions
Explanation
Blood, semen and vaginal secretions carry enough virus to transmit infection, but saliva contains too little and is even mildly antiviral. This is why sharing meals or kissing does not spread HIV, an important fact for removing stigma.
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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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