J Korean Med Sci.  2011 Feb;26(2):184-190. 10.3346/jkms.2011.26.2.184.

Nasopharyngeal Pneumococcal Carriage of Children Attending Day Care Centers in Korea: Comparison between Children Immunized with 7-valent Pneumococcal Conjugate Vaccine and Non-immunized

• Kim KH
• Hong JY
• Lee H
• Kwak GY
• Nam CH
• Lee SY
• Oh E
• Yu J
• Nahm MH
• Kang JH

• KMID: 1782104
• DOI: http://doi.org/10.3346/jkms.2011.26.2.184

Abstract

To confirm the effect of 7-valent pneumococcal conjugate vaccine (PCV7), pneumococcal nasopharyngeal (NP) carriage was compared between vaccinated (3 + 1 doses PCV7) and non-vaccinated children. Vaccinated subjects were recruited from highly vaccinated regions (> or = 60%), Seoul and Incheon whereas control subjects were recruited from Jeju Island where vaccination rates are low (< 15%). NP swabs were obtained from 400 children aged 18-59 months. Serotype and antibiotic susceptibility was analyzed. Pneumococcal carriage rate was 18.0% (36/200) and 31.5% (63/200) for the vaccinated and control group, respectively. Among those vaccinated, 41.7% (15/36) of the serotypes were vaccine-related type (VRT: 6A, 6C, 19A) with the most common serotype 6C. The next common type was non-typable/non-capsule 30.6% (11/36) followed by non-vaccine type 16.7% (6/36) and vaccine type (VT) serotypes were found in only 11.1% (4/36). In contrast, 52.4% (33/63) of the isolates in the control group were VT. Resistance rates for penicillin and erythromycin were lower in the vaccine group (vaccine vs control; penicillin 45.2% vs 71.4%, erythromycin 74.2% vs 90.5%, P < 0.05). Multi-drug resistance was also lower in vaccinated subjects (vaccine vs control; 45.2% vs 69.8%, P < 0.05). PCV7 reduces carriage in VT which leads to replacement of pneumococci by antibiotic susceptible VRT or non-vaccine type strains.

Keyword

Streptococcus pneumoniae; Heptavalent Pneumococcal Conjugate Vaccine; Epidemiology; Child Day Care Centers

MeSH Terms

Adult
Carrier State/*immunology/prevention & control
Child
*Child Day Care Centers
Child, Preschool
Humans
*Immunization
Infant
Male
Microbial Sensitivity Tests
Nasopharynx
Pneumococcal Infections/*epidemiology/immunology/*prevention & control
Pneumococcal Vaccines/*administration & dosage
Prospective Studies
Republic of Korea/epidemiology
Serotyping
Streptococcus pneumoniae/*isolation & purification

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