Evolving pneumococcal serotypes and sequence types in relation to high antibiotic stress and conditional pneumococcal immunization.

Abstract:

:In Taiwan, beginning in 2013, the 13-valent pneumococcal conjugate vaccine (PCV13) was provided free of charge to children 2-5 years of age. In 2014, this was extended to children 1-5 years old. During 2012-2014, 953 cases of culture-confirmed pneumococcal disease (CCPD), including 104 invasive pneumococcal disease (IPD), were prospectively identified and analyzed at a 3,700-bed hospital in Taiwan. From 2012 to 2014, the incidence per 10,000 admissions decreased from 26.7 to 20.4 for CCPD (P < 0.001) and from 3.2 to 1.9 for IPD (P < 0.05). Significant reduction of PCV13 serotypes was firstly noted in children in 2013 and extended to both paediatric and adult populations in 2014. Simultaneously, the incidence per 10,000 admissions of non-PCV13 serotypes increased from 6.1 in 2012 to 9.3 in 2014 (P < 0.005). The most prevalent non-PCV13 serotypes were 15A, 15B, and 23A, each containing a predominant clone, ST63(15A), ST83(15B), and ST338(23A). From 2012 to 2014, isolates with penicillin minimum inhibitory concentrations >2 mg/L decreased from 27.8% to 8.1% (P < 0.001) among all isolates. PCV13 immunization in young children demonstrated an early protective effect in all ages. However, in the elderly, the effect was compromised by an emergence of non-PCV13 serotypes.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Su LH,Kuo AJ,Chia JH,Li HC,Wu TL,Feng Y,Chiu CH

doi

10.1038/srep15843

subject

Has Abstract

pub_date

2015-11-02 00:00:00

pages

15843

issn

2045-2322

pii

srep15843

journal_volume

5

pub_type

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