[SaneVax: Antibiotics were once considered to be the greatest invention in medicine. Infections that were once deadly could now be treated successfully. But too much of a good thing can also be deadly. Overuse of antibiotics created an environment that spawned MRSA and other deadly bacteria resistant to currently used antibiotics.
Is a similar situation being caused by the overuse of vaccines? Vaccines are being created for everything under the sun and being administered to healthy people in hopes of avoiding one condition or another. Those in charge need to heed the lesson learned from overuse of antibiotics. Bacteria and viruses have one sole purpose for their existence – to survive! When attacked or suppressed they will mutate. Whether those mutations are more or less dangerous remains to be seen.]
When Vaccines Turn Vicious
By Ruth Williams
The very vaccines used to prevent a respiratory disease in chickens caused several recent outbreaks of the same disease at farms across Australia, according to a report published today (July 12) in Science. Different weakened versions of a live herpes virus used in the vaccines exchanged portions of their genomes, resulting in virulent, disease-causing strains. This suggests that such in-the-field genetic recombination is more common than previously thought, and has implications for both animal and human health.
“I think that we completely underestimate the role of recombination in [vaccine] viruses,” said veterinary virologist Etienne Thiry of the University of Liège in Belgium, who was not involved in the work. “All RNA and DNA viruses do recombine to different extents,” he said. In fact, recombination, also known as reassortment, was part of the method used by one of the two groups that recently succeeded in making the H5N1 bird flu virus transmissible between ferrets in a laboratory setting.
But while researchers were well aware that viruses could recombine, “we didn’t really think that recombination could be a problem in the field,” said Joanne Devlin, a veterinary scientist at the University of Melbourne who led the study. “We should probably reassess that risk.”
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