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Effectiveness of abbreviated and delayed 7-valent pneumococcal conjugate vaccine dosing regimens

Barbara E Mahon1, Katherine Hsu, Sudharani Karumuri

  • 1Departments of Epidemiology and Pediatrics, T3E, Boston University School of Public Health and Medicine, 715 Albany Street, Boston, MA 02118, USA. mahonbe@bu.edu

Vaccine
|January 19, 2006
PubMed

Insights

Abbreviated pneumococcal conjugate vaccine (PCV7) regimens show reduced effectiveness. The full PCV7 schedule offers 90.5% protection, while abbreviated infant doses provide less, highlighting the importance of complete vaccination.

Area of Science:

  • Pediatrics
  • Immunology
  • Vaccinology

Background:

  • Invasive pneumococcal disease (IPD) remains a significant threat to young children.
  • The 7-valent pneumococcal conjugate vaccine (PCV7) has been crucial in reducing IPD incidence.
  • Evaluating abbreviated vaccination schedules is essential for optimizing public health strategies.

Purpose of the Study:

  • To estimate the vaccine effectiveness (VE) of various abbreviated 7-valent pneumococcal conjugate vaccine (PCV7) dosing regimens.
  • To compare the VE of incomplete PCV7 schedules against the full vaccination series.
  • To inform policy regarding the use of partial PCV7 vaccination in children under 5.

Main Methods:

  • Analysis of serotyped IPD cases in children under 5 from US surveillance programs (2001-2004).
  • Calculation of VE using Mantel-Haenszel methods, comparing vaccinated and unvaccinated children.
  • Stratification by vaccination regimen: 1 dose < 3 months, 2 doses < 5 months, 3 doses < 7 months, full schedule, and delayed infant doses (12-23 months).

Main Results:

  • The full PCV7 schedule demonstrated high VE (90.5%).
  • Abbreviated regimens showed reduced effectiveness: 3 doses < 7 months (76.6%) and 2 doses < 5 months (70.5%).
  • Single-dose regimens and those initiated later (12-23 months) provided inconclusive or no significant protection against vaccine-type IPD.

Conclusions:

  • The full 3-dose infant PCV7 regimen with a booster is most effective.
  • Two- and 3-dose infant PCV7 regimens offer significant protection when the complete series is not feasible.
  • Limitations exist for abbreviated dosing, particularly for single doses or delayed initiation, underscoring the importance of adhering to recommended vaccination schedules.

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