Which virus caused smallpox?
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The variola virus
The name comes from Latin „varius“ (spotted).
💡 Did you know? It infected humans only.
13 questions · History
Smallpox is one of the deadliest diseases in human history and at the same time the only one humankind has ever completely eradicated. It was caused by the variola virus, which jumped from person to person by droplets. The disease covered the body with pus-filled pustules; about one third of the sick died, survivors often bore disfiguring scars or went blind. For thousands of years smallpox claimed countless victims and changed the course of history, for instance when introduced pathogens wiped out much of the indigenous population of the Americas. The turning point came in 1796 with the English country doctor Edward Jenner: he observed that milkmaids infected with harmless cowpox were immune to real smallpox. From the Latin word for cow, „vacca“, came the term „vaccination“. Jenner's discovery was the birth of immunisation. More than a century and a half later the World Health Organization launched a worldwide vaccination campaign. In 1980 the WHO officially declared smallpox eradicated; a unique triumph of medicine that shows what global cooperation can achieve.
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The variola virus
The name comes from Latin „varius“ (spotted).
💡 Did you know? It infected humans only.
The only disease ever eradicated
The virus survives only in high-security labs.
💡 Did you know? A one-of-a-kind medical success.
Edward Jenner
He used harmless cowpox for protection.
💡 Did you know? He is seen as the founder of vaccination.
From the cow
Latin „vacca“ means cow.
💡 Did you know? Jenner inoculated with cowpox.
1980
The last natural case occurred in 1977.
💡 Did you know? It ended a scourge thousands of years old.
Pus-filled pustules
They covered the whole body.
💡 Did you know? Survivors often kept deep scars.
About one third
For some forms the death rate was even higher.
💡 Did you know? In the 20th century hundreds of millions died of it.
Scars and blindness
The pockmarks stayed for life.
💡 Did you know? Smallpox was a common cause of blindness.
The indigenous peoples of the Americas
They had no immunity to the pathogen.
💡 Did you know? Whole cultures collapsed as a result.
By droplets
Scabs and clothing could also transmit it.
💡 Did you know? This made it highly contagious.
Variolation
A small amount of real smallpox material was transferred.
💡 Did you know? This was riskier than Jenner's method.
The WHO
It launched the programme in the 1960s.
💡 Did you know? Vaccination teams travelled to the remotest villages.
Only in a few high-security labs
Officially in the USA and Russia.
💡 Did you know? Whether it should be destroyed is disputed.
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