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Streptococcus pneumoniae

Streptococcus pneumoniae exist in 84 known antigenic types. Each type differs from the others in the structure of its polysaccharide capsule known as serotypes. Therefore, from the point of view of the adaptive immune system, each and every serotype of S. pneumoniae symbolizes a distinct organism. The result is that essentially the similar pathogen can cause disease numerous times in the similar individual.

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