Sean Fleming. Smallpox existed for thousands of years, killed millions, and was fatal in up to 30% of cases. It was eradicated by a collaborative global vaccination programme led by the World Health Organization. The last known natural case was in Somalia in 1977. It was feared for millennia and among the most deadly diseases facing humankind ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.