Peer-reviewed article
Power of public health advice: Effectiveness and spillover effects of federal vaccine recommendations.
Junying Zhao, Ahmed El Fatmaoui, Mahla Shourian, Bethanie Lor, Pallab K Ghosh ·
Summary
Written by AI, not yet AICS's view · claude-haiku-4-5-20251001This study examined how federal vaccine recommendations in the US affected influenza vaccination rates among children and adults from 2004 to 2015. Recommendations in 2008 and 2010 increased vaccination likelihood by 21-27% in children and 5-7% in older adults. The 2009 H1N1 vaccine recommendation also had spillover benefits, increasing influenza vaccination among younger adults. However, vaccination rates remain low among uninsured, low-income, and certain racial and ethnic groups.
Key points
- Federal influenza vaccine recommendations in 2008 and 2010 increased vaccination likelihood by 20.9-26.5% among children and 5.2-6.6% among older adults
- The 2009 H1N1 vaccine recommendation had positive spillover effects, increasing influenza vaccination likelihood by 5.7-9.8% among younger adults
- Low vaccination rates persist among uninsured children, privately insured children, low-income families, and uninsured or publicly insured adults
- Racial and ethnic disparities exist, with White, African American, and Hispanic American populations showing lower vaccination likelihoods in certain groups
- Future policies should address cost barriers for uninsured populations and multi-level non-cost barriers for other groups
Limitations
The study is observational with before-after comparison design, so it cannot establish causation definitively or rule out confounding factors. The analysis focuses on US national data and may not generalise to other countries or healthcare systems.
Abstract
OBJECTIVES: This paper focuses on the national-level, inexpensive, demand-side vaccine policy-federal recommendations. It evaluates the effectiveness of 2008 and 2010 influenza vaccine recommendations, the spillover effect of the 2009 H1N1 vaccine recommendation on influenza vaccination, and heterogeneous policy effects across individual characteristics. STUDY DESIGN: Observational study with before-after comparison assessing changes in vaccination following policy implementation. METHODS: We used nationally representative 2004-2015 NHIS data on 77,361, 23,653, and 238,866 individuals in age groups targeted by the 2008, 2009, and 2010 policies, respectively. Using the Linear Probability Model with fixed effects, we estimated policy effectiveness, spillover effects, and heterogeneous effects across individual characteristics. RESULTS: Both 2008 and 2010 influenza vaccine recommendations boosted influenza vaccination likelihood by 20.9-26.5 % among children and 5.2-6.6 % among older adults. The 2009 H1N1 vaccine recommendation had a positive spillover effect, with a 5.7-9.8 % increase in influenza vaccination likelihood among younger adults. Low influenza vaccination likelihoods exist across demographic and socioeconomic characteristics: Children uninsured or privately insured, White, and low-income; Adults uninsured or publicly insured, White, African and Hispanic American, male, childless, self-reported poor or excellent health, low-educated, and low-income. CONCLUSIONS: Future policies may address the cost barriers faced by the uninsured, and multi-level non-cost barriers experienced by privately insured children and publicly insured adults. Future policies may consider extending beyond the federal recommendation, such as implementing simultaneous anti-poverty policies, to achieve minimum coverage and utilize the spillover effects of one vaccine policy to maximize coverage of other vaccines. Future research may investigate potential policy spillover effects among influenza, COVID-19, RSV, and new vaccines.