How the MMRV protects against 4 potentially serious illnesses, including chickenpox

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Small boy in a yellow top being held in his mother's arms

This blog post was last checked and updated January 2026. Due to the introduction of a varicella (chickenpox) vaccination programme, the measles, mumps, rubella and varicella (MMRV) vaccine replaced the MMR vaccine in the routine childhood programme from the 1 …