All of the following diseases caused by Viruses Except: ____________?
Correct answer: D. Diphtheria
- A. Poliomyelitis
- B. Common cold
- C. Yellow fever
- D. Diphtheria
- E. Encephalitis
Explanation
Diphtheria is caused by the bacterium Corynebacterium diphtheriae, not by a virus. Poliomyelitis, many cases of common cold, yellow fever and viral encephalitis are caused by viruses. Students may choose encephalitis because some cases have non-viral causes, but viral encephalitis is a recognized viral disease.
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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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