Streptococcus anginosus group: Difference between revisions
From IDWiki
Streptococcus anginosus group
mNo edit summary |
m (Text replacement - "[[Cellular shape::" to "[[Shape::") |
||
| (3 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
==Background== |
|||
| ⚫ | |||
| ⚫ | |||
* 20-30% clindamycin resistance |
|||
===Microbiology=== |
|||
*Catalase [[Catalase::negative]], variably hemolytic [[Stain::Gram-positive]] [[Shape::coccus|cocci]] within the [[viridans group streptococci]] |
|||
| ⚫ | |||
**''S. anginosus'' has two subspecies: ''S. anginosus'' subsp. ''anginosus'' and ''S. anginosus'' subsp. ''whileyi'' |
|||
**''S. constellatus'' has three subspecies: ''S. constellatus'' subsp. ''constellatus'', ''S. constellatus'' subsp. ''pharyngis'', and ''S. constellatus'' subsp. ''viborgensis'' |
|||
| ⚫ | |||
*Normal flora of oral cavity, throat, stool, and vagina |
|||
*Identified using three rapid tests: |
|||
**Voges-Proskaur (VP) test for acetoin production |
|||
**Arginine hydrolysis |
|||
**Failure to ferment sorbitol |
|||
==Clinical Manifestations== |
|||
*Tendency to form [[Abscess|abscesses]], unlike other [[streptococci]], which can be polymicrobial with [[anaerobes]] and [[Enterobacterales]] |
|||
*Infections can range in severity, and include [[pharyngitis]], [[dental abscess]], [[skin and soft tissue infection]], [[pneumonia]], [[empyema]], [[lung abscess]], [[brain abscess]], [[liver abscess]], and [[kidney abscess]] |
|||
==Investigations== |
|||
*Presence of bacteremia without focus should prompt investigations to identify an occult abscess |
|||
*The [[HANDOC score]] can assess need for [[echocardiography]] |
|||
==Management== |
|||
*Typically treated with [[Is treated by::ceftriaxone]] or other third-generation [[Cephalosporins|cephalosporin]] pending susceptibilities |
|||
*If found in an abscess, should be considered polymicrobial and treated with concomitant [[metronidazole]] |
|||
*Clindamycin resistance is high, approximately 20-30% |
|||
{{DISPLAYTITLE:''Streptococcus anginosus'' group}} |
|||
[[Category:Gram-positive cocci]] |
[[Category:Gram-positive cocci]] |
||
Latest revision as of 18:25, 13 October 2020
Background
Microbiology
- Catalase negative, variably hemolytic Gram-positive cocci within the viridans group streptococci
- Contains Streptococcus anginosus, Streptococcus constellatus, and Streptococcus intermedius
- S. anginosus has two subspecies: S. anginosus subsp. anginosus and S. anginosus subsp. whileyi
- S. constellatus has three subspecies: S. constellatus subsp. constellatus, S. constellatus subsp. pharyngis, and S. constellatus subsp. viborgensis
- Have a buttered popcorn smell on plate
- Normal flora of oral cavity, throat, stool, and vagina
- Identified using three rapid tests:
- Voges-Proskaur (VP) test for acetoin production
- Arginine hydrolysis
- Failure to ferment sorbitol
Clinical Manifestations
- Tendency to form abscesses, unlike other streptococci, which can be polymicrobial with anaerobes and Enterobacterales
- Infections can range in severity, and include pharyngitis, dental abscess, skin and soft tissue infection, pneumonia, empyema, lung abscess, brain abscess, liver abscess, and kidney abscess
Investigations
- Presence of bacteremia without focus should prompt investigations to identify an occult abscess
- The HANDOC score can assess need for echocardiography
Management
- Typically treated with ceftriaxone or other third-generation cephalosporin pending susceptibilities
- If found in an abscess, should be considered polymicrobial and treated with concomitant metronidazole
- Clindamycin resistance is high, approximately 20-30%
