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maintains the combined vaccine triggers a stronger immune response and a higher fever in some children, which makes a seizure more likely.
The findings are in line with a 2010 study of the MMRV vaccine used in the United States, known as Omega Seamaster Aqua Terra Master Co-axial
She said children are actually much more likely to suffer a high fever and seizure if they were to catch the measles.
In theory, one shot sounds better Omega Speedmaster Apollo 15 than two. But in the new study, 1 year olds who received Priorix Tetra the MMRV vaccine used in Canada were twice as likely to develop a fever related seizure as children who got separate MMR and chickenpox shots.
In the United States, parents now have to explicitly ask for the MMRV if they want their toddler to have it, said Dr. Nicola Klein, who led the ProQuad study.
Overall, the study found, children's seizure rate peaked seven to 10 days after they were vaccinated. At that point, there were almost six seizures for every 10,000 doses of the MMRV, versus two seizures for every 10,000 doses of the separate vaccines.
Combo Vaccine Raises Risk of Fever
But even with the increased risk posed by the MMRV vaccine, the odds of a brief, fever related seizure are extremely low.
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MacDonald's findings, published online June 9 in CMAJ (Canadian Medical Association Journal), are based on records for almost 278,000 Alberta children between the ages of 12 and 23 months. The children received either the MMRV or separate MMR and chickenpox shots on the same day.
"You see the same increase in risk with these different formulations," said MacDonald, referring to the Priorix Tetra and ProQuad vaccines.
It's not clear why the MMRV is more likely to cause a fever related seizure than the separate shots, said Shannon MacDonald, a post doctoral fellow at the University of Calgary in Alberta, Canada, who led the new study. But one theory Omega Seamaster 300 Gold
At issue is a vaccine that targets measles, mumps, rubella and varicella (chickenpox) in one shot, instead of giving the traditional MMR and varicella vaccines separately.
"Get your child vaccinated," she stressed. "We're in the middle of a 20 year high in measles cases."
And the seizures aren't dangerous, "though they are scary for parents," said Klein, co director of the Kaiser Permanente Vaccine Study Center in Oakland, Calif.
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