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The 16 pages that link to Streptococcus pneumoniae, each with the reason it gives.

• Gram-positive bacteriaBroader topic: Its characteristic morphology and Gram reaction aid laboratory recognition.

• PneumoniaRelated: It is a leading bacterial cause of pneumonia.

• Otitis mediaBroader topic: It is one of the leading bacterial causes of acute otitis media.

• Streptococcus pyogenesCompared with: Despite sharing a genus, it is not the usual cause of strep throat.

• Bacterial capsuleBroader topic: Its polysaccharide capsule is a major determinant of virulence and vaccine targeting.

• Bacterial meningitisBroader topic: It is a leading cause of bacterial meningitis in adults.

• Neisseria meningitidisCompared with: It is another major cause of bacterial meningitis, with different cell structure and prevention strategies.

• Group A StreptococcusCompared with: It is a major human pathogen in the same genus but is not a group A streptococcus.

• Pneumococcal vaccineNarrower topic: Its capsule and diverse serotypes shaped the design of pneumococcal vaccines.

• Capsular polysaccharideBroader topic: Its capsule is a major virulence factor, and capsule types guide vaccine coverage.

• Streptococcus thermophilusCompared with: Its major clinical role contrasts with S. thermophilus’s established use in dairy.

• Acute otitis mediaRelated: It is one of the leading bacterial causes of acute middle-ear infection.

• LegionellaCompared with: It is a frequent pneumonia cause, but does not share Legionella’s characteristic water-aerosol exposure.

• Haemophilus influenzaeCompared with: It shares respiratory and invasive disease niches but differs in cell structure and vaccines.

• StreptococcusBroader topic: This species is a major cause of community-acquired pneumonia.

• Chlamydia pneumoniaeCompared with: It is a major alternative cause of pneumonia with different cell structure and typical disease patterns.