A vaccine that combines conventional MMR (Measles, Mumps, Rubella) with Chikenpox has been withdrawn in the United States due to a higher rate of seizures in children. In a study children aged 12 to 23 months who received the combined MMR cum Chickenpox vaccine had double the rate of seizures compared to children who got separate vaccine for MMR and chickenpox. This equates to one additional case of convulsion per 2000 vaccinations.
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