Scientists have discovered extinct strains of smallpox in the teeth of Viking skeletons – proving for the first time that the killer disease plagued humanity for at least 1400 years. Smallpox spread via infectious droplets, killed around a third of sufferers and left another third permanently scarred or blind. Around 300 million people died from it in the 20th century alone before it was officially eradicated in 1980 — the first human disease to be wiped out.
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