Marek's disease

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2015 Adrian Hill, a vaccine researcher at the University of Oxford in the United Kingdom, says the experiments support the idea that vaccines helped make Marek's disease deadlier, but don't prove it.
2015 Science - Could some vaccines make diseases more deadly?
2018 Quanta - Vaccines Are Pushing Pathogens to Evolve
2018 Read and his colleagues are studying how the herpesvirus that causes Marek's disease - a highly contagious, paralyzing and ultimately deadly ailment that costs the chicken industry more than $2 billion a year - might be evolving in response...
2021 McGill - The Doomsday Prophecy of Dr. Geert Vanden Bossche A Belgian virus expert has scared the Internet by claiming the COVID-19 vaccines will doom humanity. No need to panic.
COVID-19 and Marek's disease links
Marek's disease vaccines
Now, Read has published a paper showing that this seems to have happened with Marek's disease, a viral infection in chickens. Marek's disease spreads when infected birds shed the virus from their feather follicles, which is then inhaled with dust...
Read and researchers at the Pirbright Institute in Compton, U.K., infected chickens with Marek's disease virus of different strains known to span the spectrum from low to high virulence.