Guidance

MMRV and febrile convulsions

Febrile convulsions are a common in children with a high fever, this guidance explains to parents and carers what a febrile convulsion is, and when to seek medical help.

• From: UK Health Security Agency
• Published: 10 December 2025

Documents

MMRV and febrile convulsions

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MMRV and febrile convulsions infographic (print version)

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Details

Young children with a fever due to infections such as measles, chickenpox and flu can sometimes have a seizure also known as a fit. This guide explains what a fit is and when to seek medical help. It also shows how common fits are in children between 6 months and 5 years. It shows how likely a fit is from the first dose of MMR and the first dose of MMRV. It can be given to parents and carers who have concerns about fits.

For more information about the MMRV vaccine, please see MMRV: a guide for parents and carers.

Published 10 December 2025