TY - JOUR
T1 - Effect of Reduced-Dose Schedules With 7-Valent Pneumococcal Conjugate Vaccine on Nasopharyngeal Pneumococcal Carriage in Children A Randomized Controlled Trial
AU - van Gils, Elske J. M.
AU - Veenhoven, Reinier H.
AU - Hak, Eelko
AU - Rodenburg, Gerwin D.
AU - Bogaert, Debby
AU - IJzerman, Ed P. F.
AU - Bruin, Jacob P.
AU - van Alphen, Loek
AU - Sanders, Elisabeth A. M.
PY - 2009/7/8
Y1 - 2009/7/8
N2 - Context The effects of reduced-dose schedules of 7-valent pneumococcal conjugate vaccine (PCV-7) on pneumococcal carriage in children are largely unknown, although highly relevant in the context of subsequent herd effects.Objective To examine the effects of a 2-dose and 2 + 1-dose PCV-7 schedule on nasopharyngeal pneumococcal carriage in young children compared with controls.Design, Setting, and Patients A randomized controlled trial of nasopharyngeal carriage of Streptococcus pneumoniae enrolling 1003 healthy newborns and 1 of their parents in a general community in the Netherlands, with follow-up to age 24 months and conducted between July 7, 2005, and February 14, 2008.Intervention Infants were randomly assigned to receive 2 doses of PCV-7 at 2 and 4 months; 2 + 1 doses of PCV-7 at 2, 4, and 11 months; or no dosage (control group).Main Outcome Measure Vaccine serotype pneumococcal carriage rates in infants in the second year of life.Results At 12 months, vaccine serotype pneumococcal carriage was significantly decreased after both PCV-7 schedules, with vaccine serotype pneumococcal carriage rates of 25% (95% confidence interval [CI], 20%-30%) and 20% (95% CI, 16%-25%) in the 2-dose and 2 + 1-dose schedule groups, respectively, vs 38% (95% CI, 33%-44%) in the control group (both P <.001). At 18 months, in the 2 + 1-dose schedule group, vaccine serotype pneumococcal carriage had further decreased to 16% (95% CI, 12%-20%) and, at 24 months, to 14% (95% CI, 11%-18%; both P <.001); whereas in the 2-dose schedule group, vaccine serotype pneumococcal carriage had remained stable at 18 months (24%; 95% CI, 20%-29%), but at 24 months had further decreased to 15% (95% CI, 11%-19%; both P <.001). In the control group, vaccine serotype pneumococcal carriage remained around 36% to 38% until 24 months.Conclusion Compared with no pneumococcal vaccination, a 2 + 1-dose and 2-dose schedule of PCV-7 resulted in significant reductions of vaccine serotype pneumococcal carriage in the second year of life.Trial Registration clinicaltrials.gov Identifier: NCT00189020 JAMA. 2009;302(2):159-167
AB - Context The effects of reduced-dose schedules of 7-valent pneumococcal conjugate vaccine (PCV-7) on pneumococcal carriage in children are largely unknown, although highly relevant in the context of subsequent herd effects.Objective To examine the effects of a 2-dose and 2 + 1-dose PCV-7 schedule on nasopharyngeal pneumococcal carriage in young children compared with controls.Design, Setting, and Patients A randomized controlled trial of nasopharyngeal carriage of Streptococcus pneumoniae enrolling 1003 healthy newborns and 1 of their parents in a general community in the Netherlands, with follow-up to age 24 months and conducted between July 7, 2005, and February 14, 2008.Intervention Infants were randomly assigned to receive 2 doses of PCV-7 at 2 and 4 months; 2 + 1 doses of PCV-7 at 2, 4, and 11 months; or no dosage (control group).Main Outcome Measure Vaccine serotype pneumococcal carriage rates in infants in the second year of life.Results At 12 months, vaccine serotype pneumococcal carriage was significantly decreased after both PCV-7 schedules, with vaccine serotype pneumococcal carriage rates of 25% (95% confidence interval [CI], 20%-30%) and 20% (95% CI, 16%-25%) in the 2-dose and 2 + 1-dose schedule groups, respectively, vs 38% (95% CI, 33%-44%) in the control group (both P <.001). At 18 months, in the 2 + 1-dose schedule group, vaccine serotype pneumococcal carriage had further decreased to 16% (95% CI, 12%-20%) and, at 24 months, to 14% (95% CI, 11%-18%; both P <.001); whereas in the 2-dose schedule group, vaccine serotype pneumococcal carriage had remained stable at 18 months (24%; 95% CI, 20%-29%), but at 24 months had further decreased to 15% (95% CI, 11%-19%; both P <.001). In the control group, vaccine serotype pneumococcal carriage remained around 36% to 38% until 24 months.Conclusion Compared with no pneumococcal vaccination, a 2 + 1-dose and 2-dose schedule of PCV-7 resulted in significant reductions of vaccine serotype pneumococcal carriage in the second year of life.Trial Registration clinicaltrials.gov Identifier: NCT00189020 JAMA. 2009;302(2):159-167
KW - ACUTE OTITIS-MEDIA
KW - INFLUENZAE TYPE-B
KW - STREPTOCOCCUS-PNEUMONIAE
KW - LONGITUDINAL DATA
KW - UNITED-STATES
KW - DISEASE
KW - COLONIZATION
KW - IMMUNOGENICITY
KW - SEROTYPES
KW - ADULTS
M3 - Article
SN - 0098-7484
VL - 302
SP - 159
EP - 167
JO - Journal of the American Medical Association
JF - Journal of the American Medical Association
IS - 2
ER -