Prior to its eradication by the World Health Organization in 1975, smallpox was the scourge of the human population. It was caused by

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  • the presence of toxins in the blood
  • the variola virus
  • the bacterium Yersinia pestis
  • a parasitic protozoan


asked Jul 12, 2012 in Health Sciences by MedicalTerm ~Expert~ (3,354 points)

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the variola virus

answered Jul 12, 2012 by MedicalTerm ~Expert~ (3,354 points)

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