Özet:

Streptococcus pneumoniae (SP) is a gram-positive bacterium with more than 90 known serotypes causing around 11% of all deaths worldwide in children aged 1-59 months. A new era in prevention of SP-related diseases started in at the beginning of 2000s when a 7-valent pneumococcal conjugate vaccine (PCV7) was recommended as the vaccine of choice in pediatric age. PCV7 dramatically reduced invasive pneumococcal diseases (IPD) among children with indirect effects noted among other age groups as well. However, thanks to a strict surveillance network, an increase in non-vaccine serotypes (NVTs) causing IPD was noted worldwide and in late 2000s a new second generation vaccine (13-valent pneumococcal conjugate vaccine-PCV13) with an expanded serotype coverage was licensed. Due to the lack of solid effectiveness data, up to know it is difficult to predict how the composition of NVTs will change after the large-scale introduction of PCV13 or whether the characteristics of the serotypes will change. Long-term surveillance of both IPD, pneumonia, acute otitis media and carriage will be crucial to ascertain whether these second generation vaccines are having the desired effect of reducing the incidence of diseases in the long term.

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