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'Leaky Vaccines' Could Spur More Dangerous Disease

Leaky Vaccine

Story at-a-glance -

  • “Leaky” vaccines that may prevent death but still allow infection and disease transmission could allow more virulent strains of disease to circulate in a population.
  • In unvaccinated chickens, the most virulent virus strains of Marek’s disease burn out on their own because they are killed quickly and have little time to spread the disease
  • When virulent strains were tested in vaccinated birds, the birds shed the virus for much longer and therefore passed it on to far more birds
  • Long-term use and overuse of “leaky” vaccines could present real problems for public health by ultimately allowing highly virulent strains of diseases to be continually transmitted and cause serious illness in the community among both the vaccinated and unvaccinated

By Dr. Mercola

In 2001, Andrew Read, evolutionary biologist at Penn State University, and colleagues published a paper stating that imperfect vaccines, which protect the host from death but allow infection and disease transmission to other hosts, may actually trigger the evolution of more virulent forms of the disease.


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