No rise in seizure risk with MMRV booster shot

One-Shot Measles, Mumps, Rubella, Varicella OK for 4- to 6-Year-Olds There is little to no risk that the four-in-one measles-mumps-rubella-chickenpox vaccine (MMRV) causes fever-related seizures in children 4 to 6 years old, a new CDC-funded study confirms. In the U.S. parents can decide to give their child the four-in-one combination MMRV vaccine (measles, mumps, rubella, chickenpox) or two separate vaccines: MMR (measles, mumps, rubella) and a chickenpox vaccine at age 1 to 2. A booster four-in-one MMRV vaccine, or MMR vaccine and a separate chickenpox vaccine at age 4 to 6, is also recommended. In 2008, a related study found that babies who got measles, mumps, rubella, and chickenpox in one shot had twice the risk for fever-related convulsions as those who got two separate shots, with measles-mumps-rubella components in one and chickenpox, or varicella, in the other. Even though the convulsion risk was quite small with the four-in-one vaccine – about one additional seizure...