title: Nasal carriage of Streptococcus pneumoniae among Hungarian children before the wide use of the conjugate vaccine.
abstract: Streptococcus pneumoniae is responsible for a significant amount of morbidity and mortality worldwide, especially among children <5 years. Healthy carriers are the most important sources of infections and the carriage also peaks in the first years of life, especially among children attending communities. In this study, for the first time in Hungary, we surveyed the nasal carriage of healthy children, just before the use of the conjugate vaccine started increasing.Nasal specimens of 358 children were cultured and pneumococci isolated. The strains were serotyped with antisera and PCR, genotyped by PFGE and their antibiotic sensitivity determined by agar dilution method.The carriage rate was 37.71%. The isolates were sensitive to most tested antibiotics, except for macrolides. In this cohort of specimens still the widespread, so-called "pediatric serotypes" dominated (14, 19F, 23F, 6A, 6B in ranking order), but three of the previously rare types: 15B, 11A and 13 were represented already by 21.5% of all strains and also a few other rare non-vaccine types (e.g. 10A or 37) were detected.The calculated vaccine coverage was 55.6% for PCV-7, 69.6% for PCV-13 and 86.7% for Pneumovax. In this cohort, only 15.9% of the children (n = 57) were vaccinated. The carriage rate of PCV-7 vaccinated children was significantly lower (30.4%) than that of the non-vaccinated group (39.2%). The clonality of the isolates was significant within each group, revealing the extensive bacterium exchange among children.
authors.affiliation: Semmelweis University Institute of Medical Microbiology, Budapest, Hungary.
authors.forename: Adrienn
authors.initials: A
authors.lastname: Tóthpál
authors.forename: Szilvia
authors.initials: S
authors.lastname: Kardos
authors.forename: Edit
authors.initials: E
authors.lastname: Hajdú
authors.forename: Károly
authors.initials: K
authors.lastname: Nagy
authors.forename: Mark
authors.initials: M
authors.lastname: Linden
authors.forename: Orsolya
authors.initials: O
authors.lastname: Dobay
mesh_terms: D002353:Carrier State / Q000382:microbiology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006814:Hungary; D008297:Male; D009666:Nose / Q000382:microbiology*; D022242:Pneumococcal Vaccines / Q000276:immunology*; D013296:Streptococcus pneumoniae / Q000302:isolation & purification*; D014611:Vaccination; D018074:Vaccines, Conjugate / Q000276:immunology
chemical_list: D022242:Pneumococcal Vaccines; D018074:Vaccines, Conjugate