I believe the original source is the 1988 PBS documentary Plagues which was hosted by Blumberg according to   Youll notice this source says may have contributed to as many as half which is weaker than the form usually stated as fact these days  Is this claim really plausible   

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I believe the original source is the 1988 PBS documentary Plagues which was hosted by Blumberg according to   Youll notice this source says may have contributed to as many as half which is weaker than the form usually stated as fact these days  Is this claim really plausible   

