Streptococcus pseudopneumoniae
species of bacterium
Streptococcus pseudopneumoniae is a Gram-positive coccus that may cause pneumonia in humans. It was first described in 2004. The organism is often mistaken for S. pneumoniae and its clinical importance is as yet uncertain. It seems likely that most cases of S. pseudopneumoniae pneumonia are misdiagnosed as S. pneumoniae.
The bacterium has a number of features that allows it to be distinguished from S. pneumoniae:
There is no pneumococcal capsule (and is therefore not typable).
It is not soluble in bile.
It is sensitive to optochin when incubated in ambient air, but appears resistant or to have indeterminate susceptibility when incubated in 5% carbon dioxide.
Commercial DNA probe hybridization tests (e.g., AccuProbe Streptococcus pneumoniae culture identification test; Gen-Probe, San Diego, CA) are falsely positive.
Penicillin is the treatment of choice. Most reported isolates are resistant to erythromycin and to tetracycline.
Begin with the source’s own compact description: “Streptococcus pseudopneumoniae” is species of bacterium. The dossier treats that line as a proposition to test through Streptococcus, pseudopneumoniae and species, not as a finished interpretation.
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The phrase “species of bacterium” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated May 31, 2026. The linked authority identifier is Q7623359. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2004.
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This entry incorporates text from “Streptococcus pseudopneumoniae” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.