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NBC News data reveals a significant drop in childhood vaccination rates across US counties. Analysis of over 3,000 jurisdictions shows a decline in measles-mumps-rubella (MMR) vaccination rates from 60% meeting the 95% threshold in 2019-2020 to less than 40% currently. This decline raises concerns about potential disease outbreaks. Interactive maps and charts allow users to explore vaccination rates and exemption percentages by location.

Prepared by Olivia Bennett and reviewed by editorial team.