News & Perspective

(CIDRAP News) – The world's last naturally acquired case of smallpox occurred almost exactly 25 years ago, the Centers for Disease Control and Prevention (CDC) notes in today's issue of Morbidity and Mortality Weekly Report.

The smallpox case occurred in the Merca District of Somalia on Oct 26, 1977, the CDC says. Less than 3 years later, in May 1980, the World Health Organization declared the world free of naturally occurring smallpox.

The close kinship between camelpox and smallpox viruses suggests that camelpox could become a threat to humans through natural processes or genetic engineering, according to researchers who sequenced the virus.