Journal Article

Effects of a nationwide Hib vaccine shortage on vaccination coverage in the United States

Shefer, Abigail, Santibanez, Tammy A., Briere, Elizabeth C., Cohn, Amanda C., Groom, Amy V.

2012

Overview

► A shortage of Haemophilus influenzae type b (Hib) vaccine occurred in the United States during December 2007 to September 2009. ► Data from the 2009 National Immunization Survey (NIS) were analyzed to examine effects on Hib vaccination coverage. ► As expected booster dose coverage was reduced, but primary series coverage was also reduced in some states. A shortage of Haemophilus influenzae type b (Hib) vaccine that occurred in the United States during December 2007 to September 2009 resulted in an interim recommendation to defer the booster dose, but to continue to vaccinate as recommended with the primary series during the first year of life. To quantify effects of the Hib shortage on vaccination coverage and to determine if any demographic subgroups were disproportionately affected. Data from the 2009 National Immunization Survey (NIS) were divided based on child's age at the onset of the shortage. Comparisons were made in primary series coverage by 9 months between children <7 months versus ≥7 months at the start of the shortage. Comparisons in primary series plus booster dose completion by 19 months were made between children who were <12 months versus ≥12 months at the start of the shortage. Nationally, there was a difference in Hib primary series completion by 9 months among children age <7 months versus ≥7 months at the start of the shortage (73.9% versus 81.2%, P<0.001). There was a large difference in the percentage of children fully vaccinated with the primary series plus booster dose by 19 months among children age <12 months versus ≥12 months at the start of the shortage (39.5% versus 66.0%, P<0.001). There were differential effects of the shortage on primary series coverage among states and for some demographic characteristics. As expected booster dose coverage was reduced consistent with interim recommendations, but primary series coverage was also reduced by 7 percentage points nationally.

• Publisher: Elsevier Ltd,Elsevier Limited
• Subject: Adolescent / Adult / Age / Allergy and Immunology / Bacterial Capsules - administration & dosage / Child, Preschool / children / Confidence intervals / Female / Haemophilus influenzae / Haemophilus influenzae type b (Hib) / Haemophilus Vaccines - administration & dosage / Haemophilus Vaccines - supply & distribution / Humans / Immunization / Immunization, Secondary - utilization / Infant / Male / sociodemographic characteristics / surveys / United States / vaccination / Vaccination coverage / Vaccine shortages / Vaccines / Young Adult