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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:
14 Dec 2018
1
0
670
Diseases and The History of Them Among The World
Date:
jan 1, 1951
Now
~ 73 years ago