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Streptococcus pneumoniae
SEM micrograph of S. pneumoniae.
Scientific classification
Domain: Bacteria
Phylum: Firmicutes
Class: Diplococci
Order: Lactobacillales
Family: Streptococcaceae
Genus: Streptococcus
Species: S. pneumoniae
Binomial name
Streptococcus pneumoniae
(Klein 1884)
Chester 1901

Streptococcus pneumoniae, or pneumococcus, is a gram-positive, alpha-hemolytic diplococcus aerotolerant anaerobe and a member of the genus Streptococcus. An important human pathogen, S. pneumoniae was recognized as a major cause of pneumonia in the late 19th century and is the subject of many humoral immunity studies.

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