Trends in Michigan early adolescent immunization: 2006-2008

Area of Science:

• Pediatric Infectious Diseases
• Public Health Surveillance
• Vaccinology

Background:

• Adolescent vaccination is crucial for preventing infectious diseases.
• Understanding vaccination trends in young adolescents is essential for public health planning.
• Coverage rates for key adolescent vaccines (Tdap, MenACWY, HPV) require ongoing assessment.

Purpose of the Study:

• To describe vaccine coverage trends for tetanus, diphtheria, and pertussis (Tdap), meningococcal conjugate (MenACWY), and human papillomavirus (HPV) vaccines in Michigan young adolescents.
• To analyze factors associated with vaccination status in this population.
• To identify temporal patterns in adolescent immunization during 2006-2008.

Main Methods:

• Utilized the Michigan Care Improvement Registry, encompassing over 57 million vaccination records.
• Examined three overlapping cohorts of 11- and 12-year-old children (each >350,000).
• Assessed vaccination coverage, demographic characteristics, funding sources, and vaccination sites.

Main Results:

• Vaccine uptake demonstrated an increasing trend from 2006 to 2008, with peak coverage in summer months.
• Over half of children receiving multiple vaccines were administered them concurrently.
• Older age, Medicaid enrollment, and prior completion of early childhood immunizations correlated with higher vaccination odds.

Conclusions:

• Adolescent vaccine coverage in Michigan is rising but remains suboptimal.
• Strategies to improve coverage include promoting vaccination during all healthcare visits and increasing public funding.
• Continued monitoring via school-based assessments is recommended to track adolescent vaccination levels.