Invasive Streptococcus pneumoniae in children, Malawi, 2004-2006

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Jennifer E Cornick1, Dean B Everett, Caroline Broughton

  • 1Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi. j.cornick@liverpool.ac.uk

Emerging Infectious Diseases
|July 14, 2011
PubMed

Insights

Invasive Streptococcus pneumoniae in Malawian children showed common serotypes 1, 6A/B, 14, and 23F. Pneumococcal conjugate vaccines (PCV10, PCV13) significantly increased serotype coverage.

Area of Science:

  • Microbiology
  • Pediatrics
  • Vaccinology

Background:

  • Streptococcus pneumoniae is a leading cause of invasive bacterial infections in children globally.
  • Pneumococcal conjugate vaccines (PCVs) have reduced disease burden, but serotype distribution and antimicrobial resistance patterns vary geographically.
  • Understanding local epidemiology is crucial for vaccine policy and treatment strategies in regions like Malawi.

Purpose of the Study:

  • To characterize the serotypes of invasive Streptococcus pneumoniae isolates from children in Malawi.
  • To assess the potential coverage of existing and next-generation pneumococcal conjugate vaccines (PCVs).
  • To determine antimicrobial resistance patterns, including chloramphenicol and penicillin, among these isolates.

Main Methods:

  • Collection and serotyping of 176 invasive Streptococcus pneumoniae isolates from children in Malawi.
  • Analysis of serotype distribution and calculation of vaccine coverage for PCV7, PCV10, and PCV13.
  • Antimicrobial susceptibility testing for chloramphenicol, penicillin, and ceftriaxone.

Main Results:

  • The most common serotypes were 1 (23%), 6A/B (18%), 14 (6%), and 23F (6%).
  • PCV7 provided 39% serotype coverage; PCV10 increased coverage to 66%, and PCV13 to 88%.
  • Chloramphenicol resistance was observed in 27% of isolates, and 10% were nonsusceptible to penicillin; all isolates remained susceptible to ceftriaxone.

Conclusions:

  • Serotype distribution in Malawi highlights the expanding role of higher-valent PCVs for enhanced protection.
  • Antimicrobial resistance, particularly to chloramphenicol, is a significant concern requiring monitoring.
  • Ceftriaxone remains a reliable treatment option for invasive pneumococcal disease in this setting.

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