[Pneumococcal sepsis 2015-2022: considerations on vaccination strategies].

Herbert Hof, Sabine Singer, Ika Steiner, Daniela Bertsch, Maria Kirstahler, Klaus Oberdorfer, Matthias Imöhl, Mark van der Linden
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Abstract

In spite of available vaccines the frequency of sepsis caused by Streptococcus pneumoniae still remains rather high.In the years 2015-2022 Streptococcus pneumoniae could be isolated from 925 blood cultures in our laboratory. Serotyping was performed from 754 strains. In addition, their in vitro susceptibility to some antibiotics was assessed.In this period 925 blood cultures were positive, predominantly from aged patients (older than 60 years) and more frequently from men than from women. In the years 2020 and 2021 less positive blood cultures were found, which could be interpreted as a result from non-pharmaceutical interventions preventing aerogenically transmitted diseases such as coronavirus infections during the epidemic. Children were also relatively susceptible in their first year of life. 653 strains were serotyped, with serotypes 3 and 8 predominating. 67% of the serotypes found were covered by the 20-valent conjugate vaccine whereas the polysaccharide vaccine (PPV23) included 75%. The vast majority of isolates was susceptible to penicillin, erythromycin as well as to doxycycline. Multi-drug resistant strains were not detected.A large part of the infections might have been prevented by vaccination assuming a high vaccine effectiveness. However, 27% of S. pneumoniae serotypes detected were not covered by any of the vaccines currently available.

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