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jan 1, 1951 - Need for Herd Immunity

Description:

Greenland: Unprotected population of 4,262 on the southern part of the island; only five people escaped infection

Added to timeline:

Diseases and The History of Them Among The World

ByMegan Forghani

14 Dec 2018

1

0

855

Date:

jan 1, 1951

Now

~ 75 years ago

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