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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 dic 1979 año - Smallpox declared eradocated

Descripción:

humans are the only host (no animal reservoirs and not found in water or dirt) and a single vaccination can protect people for 5+ years. The WHO ceased the intense vaccination programs

Añadido al timeline:

Diseases that challenged the scientific community

ByErica Nguyen
14 dic 2018
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fecha:

1 dic 1979 año
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~ 45 years ago
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