Streptococcus pneumoniae is a topic covered in the Johns Hopkins HIV Guide.

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MICROBIOLOGY

  • Streptococcus pneumoniae (pneumococcus): Gram-positive diplococcus with polysaccharide capsule, demonstrated by Quellung reaction or capsular swelling when antibodies bind to capsular polysaccharide antigen.
  • Ecologic niche is nasopharynx, colonizes 5-10% of adults, 20-40% of children.
    • Definite pathogen when isolated from sterile site (blood, CSF, pleural or joint fluid).
    • Probable pathogen in respiratory specimens (Gram stain or culture) or when urine Ag+ in setting of pneumonia.

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Last updated: December 9, 2015