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MMR vaccination rates have been declining in most US counties since the pandemic
A new county-level data set from researchers at Johns Hopkins University shows a national decline in childhood measles-mumps-rubella (MMR) vaccination rates since the start of the Covid-19 pandemic. Of 2,066 counties surveyed, 1,614 counties, 78%, saw vaccine waste and county-level average vaccination rates fall by 93.92% pre-pandemic to 91.26% post-pandemic—an average decline of 2.67%, while moving further from 95% of the spread limit to forecast spread to benefit. Only four of the 33 states surveyed - California, Connecticut, Maine and New York - reported vaccination rates at the median county level. The data will be today...
MMR vaccination rates have been declining in most US counties since the pandemic
A new county-level data set from researchers at Johns Hopkins University shows a national decline in childhood measles-mumps-rubella (MMR) vaccination rates since the start of the Covid-19 pandemic.
Of 2,066 counties surveyed, 1,614 counties, 78%, saw vaccine waste and county-level average vaccination rates fall by 93.92% pre-pandemic to 91.26% post-pandemic—an average decline of 2.67%, while moving further from 95% of the spread limit to forecast spread to benefit.
Only four of the 33 states surveyed - California, Connecticut, Maine and New York - reported vaccination rates at the median county level.
The data will be published today inJama.
The data comes as more than a thousand cases of measles have been reported in the United States this year. With the exception of 2019, this is the most cases reported in the United States in a single year in over three decades, with the vast majority of cases occurring in unvaccinated children.
“This open, high-resolution dataset provides a critical resource to examine and better understand the country's vaccination landscape and its impact on measles risk" said lead author Lauren Gardner, director of the Center for Systems Science and Engineering at Johns Hopkins University, an expert in using data and modeling to better understand the spread of disease. This work draws on her experience leading the data collection efforts behind the Johns Hopkins Covid-19 Dashboard in the pandemic.
Gardner created Johns Hopkins' Covid-19 dashboard, which the world relied on to track cases during the pandemic.
County-level vaccination data complement state and national levels from the Centers for Disease Control and Prevention and confirm widespread declines in MMR vaccination rates in the US following the Covid-19 pandemic, while demonstrating significant heterogeneity in vaccination patterns within and across states.
The team collected 2 district-level dose MMR vaccination rates for kindergarten teachers from 2017 to 2024, where available. The data set contains at least one year of vaccination data for 2,237 counties in 38 states.
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