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Loss of Control by Immune System Could Induce a Latent Herpes Virus to Become Active Again

by Kathy Jones on November 5, 2012 at 8:54 PM
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 Loss of Control by Immune System Could Induce a Latent Herpes Virus to Become Active Again

In an attempt to find the reason why a latent herpes virus becomes active once again, a new study published in the Journal of Leukocyte Biology suggests that one of the reasons could be the weakening control of the immune system over the virus as it tries to fight new microbial threats.

"Because almost all people are infected by one or more herpes family viruses during their lifetime, the potential impact of these findings are significant," said Charles H. Cook, M.D., FACS, FCCM, director of surgical critical care at The Ohio State University College of Medicine in Columbus, Ohio, and a researcher involved in the work. "We hope that by understanding how these latent viral infections are controlled that we can prevent reactivation events and improve people's lives."

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To make this discovery, researchers studied mice with latent herpes family cytomegalovirus (CMV) during severe bacterial infections. They found that T-cells responsible for CMV control were reduced significantly during a new infection with bacteria. This, in effect, reduced the "brakes" which kept the virus under control, allowing the virus to reactivate and cause disease. When the immune system eventually sensed the reactivation, the memory T-cell levels returned to normal, effectively restoring the body's control over the virus.

"Finding ways to control herpes flare ups is important, not only for the health of the person with the virus, but also for preventing its transmission," said John Wherry, Ph.D., Deputy Editor of the Journal of Leukocyte Biology. "This report highlights the important interplay when we are 'co-infected' with more than one microbe and provides important insights into why the immune system sometimes fails as well as how it can regain control of latent herpes virus infections."



Source: Eurekalert
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