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Combined vaccine not tied to seizures in older kids

NEW YORK: Although the combined vaccine against measles, mumps and chickenpox comes with a small risk of fever-related seizures in toddlers, a new study suggests that's not true in older

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قديم 04-13-2012, 11:18 PM
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افتراضي Combined vaccine not tied to seizures in older kids

NEW YORK: Although the Combined vaccine against measles, mumps and chickenpox comes with a small risk of fever-related seizures in toddlers, a new study suggests that's not true in older children.

The measles-mumps-rubella-varicella (MMRV) vaccine has been available in the U.S. since 2005. It combines the traditional MMR vaccine with the anti-chickenpox shot so young children can undergo fewer jabs.

But after its release, the MMRV vaccine was found to carry a small risk of fever-related seizures in one- to two-year-olds -- the age at which the first dose of the vaccine is given.

Fever-related, or "febrile," seizures are short-lived, lasting about a minute or two.

Though the seizures are "very scary" for parents, "they are not dangerous, and they do not lead to later epilepsy or seizure disorders," lead researcher Dr. Nicola Klein, co-director of the Kaiser Permanente vaccine Study Center in Oakland, California.

Experts now recommend that parents opt for either the MMRV or separate MMR and varicella shots for their toddlers. The separate shots seem to cut the odds of a fever-related seizure.

But that has still left questions about the second MMRV vaccine, which is given between the ages of four and six. In the new study, researchers found no evidence that the vaccine significantly raised the risk of fever-related seizures in those older children.

The findings, reported in the journal Pediatrics, are based on medical records for nearly 87,000 four- to six-year-olds who received the MMRV shot between 2006 and 2008. Another 67,000-plus received the MMR and varicella vaccines separately, on the same day, between 2000 and 2008.

One child had a fever-related seizure seven to 10 days after getting the MMRV vaccine -- the time frame in which one- to two-year-olds appear to be at risk. No seizures were recorded in kids who had the MMR and varicella shots separately.

The findings suggest the vaccine carries no particular risk of the seizures in older kids. Fever-related seizures are fairly common in children; according to the National Institutes of Health, about one in every 25 kids will have at least one fever-related seizure though they most often affect toddlers.

So it's not surprising that the MMRV shot has been linked to seizures in toddlers, but not in older kids, according to Klein's team.

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