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Chickenpox: Why the UK Has Approved the MMRV Vaccine in Under-Fours but the US Is Preparing to Restrict It

The UK aims to improve vaccination uptake with MMRV for under fours while the US limits use due to a slight increased febrile seizure risk of 1 in 2,300 doses.

Summary by Medical Xpress
Two countries, two different approaches to protecting children from chickenpox. While the UK prepares to introduce a combined vaccine covering measles, mumps, rubella and chickenpox (MMRV) in a single jab, the US is moving in the opposite direction—restricting parents' ability to choose that same combination for their youngest children.

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The Conversation broke the news in on Monday, September 29, 2025.
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