The CDC has reported today that in last year, several people accidentally received blood products with yellow fever vaccine in them. The investigation documents evidence for transmission of vaccine virus through infected blood products.
This raises a question frequently asked about live virus vaccines -- if blood products contaminated with yellow fever vaccine can transmit vaccine strain virus infection, then couldn’t the vaccines themselves also do so when they are injected?
Viral transmission has been documented to occur with live virus polio and varicella vaccines. http://bit.ly/ahNegI
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