Febrile seizures

Chickenpox

Measles-mumps-rubella-varicella combination vaccine and the risk of febrile seizures. 2010, Klein, Pediatrics

MMRV increases the risk of febrile seizures 7-10 days post vaccination by 2, as compared to separate vaccines (MMR and varicella).
MMRV increases the risk of febrile seizures by 7.6 times, MMR+V by 4 times, and MMR separately by 3.7 times. (USA)

Chickenpox

Risk of febrile seizures after first dose of measles-mumps-rubella-varicella vaccine: a population-based cohort study. 2014, MacDonald, CMAJ

MMRV increases the risk of febrile seizures by 6.5 times, and MMR+V by 3.3 times. (Canada)

Chickenpox

Risk of febrile convulsions after MMRV vaccination in comparison to MMR or MMR+V vaccination. 2014, Schink, Vaccine

The same was found in Germany, where a different vaccine was used (Priorix-Tetra). MMRV is associated with a four times increase in the risk of febrile seizures as compared to MMR, and 3.5 increase as compared to MMR+V.

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