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Abstract
Pertussis (whooping cough) is a highly contagious respiratory infection that poses severe risks to infants, with over half of cases under age one requiring hospitalization. Vaccination is the most effective prevention, yet Oregon failed to meet the Healthy People 2010 goal of 90% coverage for two-year-olds. Using 2007–2009 National Immunization Survey data, this study examined sociodemographic factors influencing up-to-date pertussis immunization among Oregon children aged 19–35 months. Results show coverage was associated with older age, continuous insurance, fewer siblings, maternal education, and Spanish-language interviews. Findings inform targeted interventions to improve vaccination rates and protect vulnerable populations from this serious disease.