Streptococcus Flashcards
Streptococcus characteristics
non motile non spore forming catalase negative facultative anaerobes oxidase negative
Habitat of Streptococcus
indeginous respiratory tract microbial flora of animals and humans
Clinical infections of Streptococcus
Endocarditis
wound infections
UTIs
respiratory infections
Streptococcus have thick peptidoglycan walls T/F
True
Techoic acid is absent in Streptococcus cell wall
False
criteria for streptococcal classification
serology
blood agar hemolysis
oxygen requirement
biochemical reaction
grouping based on oxygen requirement
facultative anarobe(aerobe) anaerobe
Streptococcus class based on serology
based on precipitation test
Groupable
Non groupable
2 surface antigen for serology classification
protein M
C substance
what are most frequent serogroups of streptococci
A, B and D
C,G and F are less frequent
What are the Streptococcus most associated with serogroup A and B
S.pyogenes for A
S.agalactiae for B
what are the classification groups based in hemolysis blood agar
alpha hemolysis: partial hemolysis, green discoloration S.pneumoniae
beta hemolysis : full hemolysis group A and B
gamma hemolysis: no lysis at all includes enterococcus
the most important biochemical test for classification of Streptococcus
catalase test
clinically important streptococcus
S.pyogenes S.agalactiae S.pnuemoniae Enterococcus spp. Viridian group of Streptococcus
Structural virulence factors of Streptococcus
Fimbriae F-protein Techoic Acid these are 2 are for binding Capsule M-protein these 2 are anti immunogenic
complications of S.pyogenes
Pharyngitis Rheumatic fever Toxic Shock Syndrome Cellulitis Acute glomerunephritis
complications of S.pyogenes
Pharyngitis Rheumatic fever Toxic Shock Syndrome Cellulitis Acute glomerunephritis
complications of S.agalactiae
Neonatal infections such as meningitis, bacteremia.
Adult infections such as postpartum sepsis
Streptococcus pneumoniae complications
Pneumonia
Endocarditis
Bacteremia
Viridian group of Streptococcus complications
pharyngitis
sepsis
bacteremia
Entercoccus spp complications
Sepsis
Endocarditis
GIT infections
Streptococcus like organisms
Aerococcus
Pediococcus
Leuconostoc
