In what year did WHO declare that smallpox was completely eradicated?
Correct answer: C. 1980
- A. 1990
- B. 2001
- C. 1980
- D. 1995
Explanation
The World Health Organization (WHO) declared that smallpox was completely eradicated in 1980. This was a major achievement in global public health, as smallpox was a highly contagious and deadly disease.
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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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