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What he's describing here is exactly what happened with "Marek's Disease" - which affected poultry flocks in the 1980s and 1990s. "Leaky" vaccines cause mutations which have a tendency to get MORE virulent, and MORE lethal. This is WELL ESTABLISHED science, and is even described in a PBS article from 2015: https://www.pbs.org/newshour/science/tthis-chicken-vaccine-makes-virus-dangerous

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