Kozel > 2nd Tier Pathogens Flashcards
what shape is pneumococcus?
lancet/ovoid
is pneumococcus encapsulated?
YES
older cultures of pneumococcus undergo ________ because why?
autolysis
autolytic enzymes are activated by surfactants (bile, detergents)
what conversion happens in pneumococcus?
rough-to-smooth conversion by transformation
what do you grow pneumococcus on?
blood agar
what is the major antigen of pneumococcus?
capsular polysaccharide
how many serological types of capsular polysaccharide does pneumococcus have?
over 90
is the capsular polysaccharide of pneumococcus essential for virulence?
YES
what is the quellung reaction?
incubation of encapsulated bacteria w/ ab makes the capsule refractile
is pneumococcus quellung positive?
YES
what is C polysaccharide?
aka teichoic acid
cell wall carb that reacts w/ acute phase protein (CRP)
what are the 5 pneumococcal infections?
pneumonia sinusitis otitis media meningitis OTHER > peritonitis, endocarditis, arthritis
pneumococcal pneumonia makes up what % of bacterial pneumonia?
80-90%
where is pneumococcal pneumonia in the lung?
usu lobar
what is the most common cause of otitis media in children >3 mo?
pneumococcus
pneumococcus causes meningitis in what age groups?
young & elderly
what 4 things characterize pneumococcal disease?
- abrupt onset
- toxicity
- fulminant course
- DIC
what causes disease in pneumococcal infections?
inflammatory response to bacterium & its pdts
what is the trick for pneumococcus to be infectious?
produce an inflammatory response but not be killed by it
what are the 3 virulence factors for strep pneumo?
polysaccharide capsule
pneumolysin
peptidoglycan & lipoteichoic acid
what virulence factor of strep pneumo is essential for virulence?
polysaccharide capsule
what fxn does the polysaccharide capsule serve?
prevents phagocytosis
what does anticapsular ab do?
protects by opsonization
what is pneumolysin?
a porin
similar to streptolysin O