Differential Effects of the DTaP and MMR Vaccine Shortages on Timeliness of Childhood Vaccination Coverage
Tammy A. Santibanez, PhD,
Jeanne M. Santoli, MD, MPH and
Lawrence E. Barker, PhD
The authors are with the Centers for Disease Control and Prevention, Atlanta, Ga.
Correspondence: Requests for reprints should be sent to Tammy A. Santibanez, PhD, Centers for Disease Control and Prevention, National Immunization Program, 1600 Clifton Rd, NE, Mail Stop E-62, Atlanta, GA 30333 (afz5{at}cdc.gov).
Objectives. We determined the effect of diphtheria and tetanustoxoids and acellular pertussis vaccine (DTaP) and measles,mumps, rubella (MMR) vaccine shortages on timeliness of thethird dose of DTaP (DTaP3), the fourth dose of DTaP (DTaP4),and the first dose of MMR (MMR1) among subgroups of preschoolchildren.
Methods. Data from the 2001 and 2002 National Immunization Surveyswere analyzed. Children age-eligible to receive DTaP3, DTaP4,or MMR1 during the shortages were considered subject to theshortage, and those not age-eligible were not subject to theshortage; timeliness of vaccinations was compared.
Results. Among children vaccinated only at public clinics, childrenresiding outside metropolitan statistical areas, and childrenin the Southern Census Region, those age-eligible to receiveDTaP4 during the shortage were less likely to be vaccinatedby 19 months of age than children not subject to the shortage.
Conclusions. There was notable disparity in the effects of therecent vaccine shortages; children vaccinated only in publicclinics, in rural areas, or in the Southern United States weredifferentially affected by the shortages.
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