In what year did the World Health Organization declare that smallpox was completely eradicated?
Correct answer: B. 1980
- A. 1990
- B. 1980
- C. 2001
- D. 1995
Explanation
Almost two centuries after Jenner hoped that vaccination could annihilate smallpox, the 33rd World Health Assembly declared the world free of this disease on May 8, 1980.
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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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