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what are some general properties of streptococci? gram positive cocci in chains, catalase negative, ferment sugars to lactic acid, causing low pH. they need enrichment with blood to support growth
describe the classificaiton of streptococci there are 20 serological groups based upon C carbohydrate (lancefied groups A-U) the preliminary grouping is based upon hemolysis of five percent sheep blood (alpha, beta, gamma hemolysis)
which class of strep have bet ahemolysis? S. pyogenes, S. agalactiae
which class of strep have gamma hemolysis? s. faecalis
which class of strep have alpha hemolysis? s. pneumoniae
what are group A step? strep pyogenes
which is group B strep? strep agalectiae?
which is group D strep? strep faecalis
what lab test do u do with strep pyogenes? bacitracin S
what lab test do u do with strep agalectiae? hippurate hydrolysis pos
what lab test do u dowith s. faecalis? bile esculin pos
what lab test do u do with s. pneumoniae? optochin S, bile solubility pos, quelling test pos.
the structural virulence factors of this bacteria are capsule, fibrils (consist of M proteins) and lipoteichoic acid, peptidoglycan layer, T and R proteins Group A strep (s. pyogenes)
the soluble virulence factors for s. pyogenes consist of this streptokinase, streptodornase, hyaluronidase, erythrogenic toxin, NADase, hemolysins
what is the pathogenesis of group A strep? encounter through infected individual or carrier, spread through tissues, and damage ellicits a strong inflammatory response. it causes chemotaxins for white blood cells. activates complement via alt. pathway
what are some localized infections caused by S. pyogenes? pharyngitis, scarlet fever, impetigo
what are some invastive infections caused by s. pyogenes? wounds, erysipelas, cellulitis, puerperal fever, endocarditis
what are some postinfection diseases caused by S. pyogenes? rheumatic fever, glolmerulonephritis
lab diagnosis of pharyngitis consists of this throat cultures and direct antigen test
what are lab tests for invasive infections? gram stain and culture, blood culture if bacteremia is present
scarlet fever is cause by what bacteria? group A strep
what is scarlet fever treated with? penicillin, long acting penicillin g, and oral penicillin for ten days to prevent rheumatic fever
what type of strep infects neonates and also causes septicemia, meningitis, and pneumonia? group B
what type of strep causes UTI's, wounds, and sepsis? group D strep
what type of strep causes subacute endocarditis and dental carries? vridans strep or alpha strep
what type of strep causes pneumonia, otitis media, and sinusidis? streptococcus pneumoniae
impetigo is caused by what? strep pyogenes. but may be mixed with staph aureus
what is the defining characteristic of erysipelas? sharp defined borders
in this disease, there are ulcers formed into the dermis and is caused by strep pyogenes ecthyma
what bacteria causes necrotizing fasciitis? strep pyogenes
these are opportunistic pathogens that do not ferment glucose gram negative nonfermenters
what are some general characteristics of pseudomonas aeruginosa motile with polar flagella, oxidase positive that are obligate aerobes, grow at 42 degrees C, colony produces a fruity odor
what are some virulence factors for pseudomonas aeruginosa pili, pollysaccharide capsule-slime layer, endotoxin (lipopolysaccharide), many extracellular enzymes, exotoxin A (inhibits protein synthesis),
pseudomonas aeruginosa forms this during tissue necrosis eschar
list some diseases caused by pseudomonas aeruginosa they afect immunocompromised or those with physical barriers: skin infections following burns, super infections following use of broad spectrum antibiotics, wounds, colonize respirators pneumonia, colonize respiratory tract patients, conjuctivitis, etc.
where is a common place u can get pseudomonas from hot tubs
this is an oxidase negative (aerobic) nonfermentative nonmotile short gram negative rod acinetobacter. it causes a variety of opportunistic and nosocomial infections similar to pseudomonas in temperate climates. has multiple drug resistance.
Created by: aferdo01