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Some Vaccines Support Evolution of More-Virulent Viruses Some Vaccines Support Evolution of More-Virulent Viruses

27 July 2015 — Scientific experiments with the herpesvirus that causes Marek's disease in poultry have confirmed, for the first time, the highly controversial theory that some vaccines could allow more-virulent versions of a virus to survive, putting unvaccinated individuals at greater risk of severe illness. The research has important implications for food-chain security and food-chain economics, as well as for other diseases that affect humans and agricultural animals.

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