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Trends and geographical variation in invasive pneumococcal infections in Finland

Peter Klemets1, Outi Lyytikäinen, Petri Ruutu

  • 1National Public Health Institute (KTL), Department of Infectious Disease Epidemiology, Helsinki, Finland.

Scandinavian Journal of Infectious Diseases
|November 4, 2008
PubMed

Insights

Invasive pneumococcal infections (IPI) in Finland increased significantly from 1995-2002, with higher rates linked to increased blood culturing. These findings highlight the need for pneumococcal conjugate vaccines.

Area of Science:

  • Epidemiology
  • Infectious Diseases
  • Public Health

Background:

  • Invasive pneumococcal infections (IPI) represent a significant public health concern globally.
  • Understanding regional variations and temporal trends in IPI is crucial for effective disease control strategies.

Purpose of the Study:

  • To evaluate regional variations and trends in invasive pneumococcal infections (IPI) in Finland between 1995 and 2002.
  • To assess the correlation between IPI rates and laboratory culture sampling rates.
  • To determine the impact of vaccine-preventable serotypes on IPI incidence.

Main Methods:

  • Utilized national, population-based laboratory surveillance data from 1995-2002.
  • Analyzed data on blood and cerebrospinal fluid (CSF) cultures from all Finnish microbiology laboratories.
  • Correlated regional IPI incidence with blood and CSF culture rates and examined temporal trends.

Main Results:

  • Overall IPI incidence was 10.6/100,000, with significant regional variation.
  • IPI rates increased by 35.1% from 1995-2002, correlating with a 29.6% increase in blood culturing rates.
  • Vaccine-targeted serotypes caused a substantial proportion of IPIs in both children and adults.

Conclusions:

  • The true incidence of pneumococcal bacteraemia in Finland may be underestimated.
  • Increased blood culturing rates are associated with higher reported IPI rates.
  • Universal childhood pneumococcal conjugate immunization could yield significant public health benefits.

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