25251 Adolescent Vaccination Uptake Among Students Participating In Tdap-Only Clinics In Deschutes County, Oregon

Wednesday, March 30, 2011: 4:20 PM

Background:  In 2008, Tdap (tetanus toxoid, diphtheria toxoid, acellular pertussis) vaccine was added as a school entry requirement for children entering 7th and 8th grade in Oregon.  Many local health departments provided Tdap through school-located vaccination clinics in 2008, using vaccine provided at no cost by the Oregon Immunization Program.  A condition of receiving free vaccine was that all administered doses had to be entered in Oregon’s Immunization Information System (IIS).

Objectives:  To examine uptake of all adolescent- recommended vaccines among children who received Tdap in a school setting.

Methods:  OR IIS data were used to describe receipt of all vaccines routinely recommended for adolescents (Tdap, meningoccocal conjugate vaccine (MCV4), Human Papillomavirus vaccine (HPV), 2nd dose Varicella vaccine) who received Tdap in school settings in Deschutes County in 2008.  Vaccine uptake was assessed using 2010 data, when participating adolescents were 12-17 years old.

Results:  1153/5380 (21%) adolescents received Tdap in school in Deschutes County in 2008. 589 (51%) were female; 292 (25%) were 10-11 years old, 761 (66%) were 12-13 years, and 100 (9%) were 14-15 years.  According to the IIS, as of October 2010, 803/1153(70%) had received no other recommended adolescent vaccines and 30% had received at least one other recommended vaccine. Among 1153 who received Tdap, 193 (16.7%) ever received MCV4, 239 (21%) ever received a second dose of Varicella, 155/589 females (26%) ever received ≥1 dose of HPV, and 62/589 (11%) received all 3 doses of HPV.

Conclusions:  A significant proportion of adolescents participating in the school-located Tdap clinics had no record of receiving other recommended vaccines.  Further study is needed to determine how school-located clinics impact adolescent vaccine uptake. Uptake among this group will be compared to a representative sample of adolescents from Deschutes County to examine differences in uptake between these groups, as well as issues related to IIS reporting.