Wednesday, March 31, 2021

Herd Immunity: What Is It? What/Who Impedes It? What Causes It To Vary? When Will Be Reach It? How Will Be Know?

 It's Possible To Reach Herd Immunity, Then Lose It.  Repeatedly.  Here's What You Can Do To Help Prevent That From Happening by Holly Yan.  CNN.  March 30, 2021.  

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