The last person to be contaminated with smallpox 

On May 8, 1980, the World Health Organization announced that smallpox was eradicated.

 The virus that causes the disease, called Orthopoxvirus, had already killed about 500 million people only in the 20th century. 

A massive vaccination campaign ensured the eradication of the disease.

 The last recorded case was in 1977 in a community in Somalia, when a 23 year old contracted the disease, but recovered. 

On August 24, 1978, a doctor named Jane Parker, was exposed to the virus by accident in a laboratory.

 It was one of the most violent strains of the virus, then she died on September 11 of the same year. 

The virus is still maintained in two government centers, one in Atlanta, USA, and the other in Koltsovo, Russia.

 WHO calls for such places destroy the samples, which would eradicate once the existence of Orthopoxvirus the face of the earth.