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ORIGINAL ARTICLE
Korean J Pediatr 2011 April;54(4) :163-168.
doi:https://doi.org/10.3345/kjp.2011.54.4.163
Immune response to 19A serotype after immunization of 19F containing pneumococcal conjugate vaccine in Korean children aged 12-23 months
Hyun Ju Lee (Lee HJ), So Eun Park (Park SE), Kyung Hyo Kim (Kim KH)
Department of Pediatrics, Ewha Womans University School of Medicine, Seoul, Korea
Center for Vaccine Evaluation and Study, Medical Research Institute, Ewha Womans University School of Medicine, Seoul, Korea
Corresponding Author: Kyung Hyo Kim ,Tel: +82.2-2650-2857, Fax: +82.2-2650-2817, Email: kaykim@ewha.ac.kr
Copyright © 2011 by The Korean Pediatric Society
ABSTRACT
Purpose : The purpose of this study was to evaluate the immune response to serotype 19A in children aged 12-23 months after immunization of the 19F containing 7-valent pneumococcal conjugate vaccine (PCV7). Methods : Blood samples from a total of 45 subjects (age 12-23 months) were included in the study. Subjects were categorized according to immunization status into three groups as follows: 18 subjects with 3 primary doses and 1 booster dose of PCV7 (booster group), 21 subjects with 3 primary doses before 12 months of age (primary group), and 6 subjects with no vaccination history of PCV7 (control group). An ELISA and opsonophagocytic killing assay (OPKA) was done to evaluate the immune responses against serotypes 19F and 19A. Results : According to the ELISA, all subjects had antibody titers 0.35 g/mL for serotypes 19F and 19A in the booster and primary group and 83.0% and 66.7% in the control group, respectively. According to the OPKA, subjects with opsonic activity (20) against serotypes 19F and 19A were 100% and 61.1% of the subjects in the booster group and 66.7% and 19.0% in the primary group, respectively. No subjects in the control group had opsonic antibodies against both serotypes. Conclusion : In conclusion, in children 12-23 months age who were previously vaccinated with PCV7, a cross-reactive immune response is elicited against serotype 19A after a primary series of 3 doses in a small proportion of subjects, and this response is amplified after booster vaccination.
Keywords: Streptococcus pneumoniae | Heptavalent pneumococcal conjugate vaccine | Antibody response
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