RE: Vaccines & Herd Immunity - Why I Don't Understand It!

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Vaccines & Herd Immunity - Why I Don't Understand It!

in health •  7 years ago 

There is also the fact that vaccines do not protect 100% of time, more like 40% to 80% depending on the vaccine, and the people vaccinated can be the cause of spreading a disease.

health
7 years ago by

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