Number of Childhood and Adolescent Vaccinations Administered Before and After the COVID-19 Outbreak in Colorado


As a consequence of the social distancing measures that have been implemented in many parts of the United States, medical visits to primary care physicians have dropped as some parents and patients worry that they could be put at risk for contracting coronavirus disease 2019 (COVID-19).1 The American Academy of Pediatrics has issued guidance suggesting that preventive visits, including vaccination, should continue, particularly for younger children.2 In this report, we assessed the number of childhood and adolescent vaccinations administered in the months before and after the start of the COVID-19 outbreak in Colorado. This interrupted time-series analysis from Colorado describes the number of childhood and adolescent vaccinations administered before and after social distancing measures were implemented. The authors report a drop-in mean immunization rate of 31% for children aged 0 to 2 years, 78% for those aged 3 to 9 years, and 82% for those aged 10 to 17 years. The reduction in immunizations started immediately following the release of social distance guidance. Trends were similar for Haemophilus influenzae type b; 13-valent pneumococcal conjugate; and measles, mumps and rubella vaccines.