FIM Pathogens Flashcards
A patient presents with folliculitis, pneumonia, necrotising fasciitis and a carbuncle. What pathogen is most likely responsible for this presentation?
Staph Aureus
A patient presents with osteomyelitis, endocarditis, gastroenteritis and a furuncle. What do you expect to see on the gram stain?
Staph Aureus
gram +ve cocci in clusters
A patient presents with septic arthritis, cellulitis, impetigo and pneumonia. What is the expected result of a catalase test for this causative pathogen?
Staph Aureus
catalase +ve
A patient presents with folliculitis, gastroenteritis, an abscess and pneumonia with patchy infiltrates. What is the expected result of a coagulase test for this causative pathogen?
Staph Aureus
coagulase +ve
A patient presents with folliculitis, gastroenteritis, a wound infection and pneumonia with patchy infiltrates. What agars (2) would facilitate the growth of this causative pathogen and what would be observed?
Staph Aureus
blood agar - golden/yellow crust
mannitol - yellow
A patient presents with folliculitis, pneumonia, necrotising fasciitis and a carbuncle. The patient was given flucloxacillin but his symptoms were not resolved. what would you prescribe?
Staph Aureus
vancomycin or teicoplanin
A patient presents with folliculitis, pneumonia, necrotising fasciitis and a carbuncle. Protein A is one of the virulence factor of this pathogen. What is its importance?
Staph Aureus
binds to Fc of IgM - prevents phagocytosis
A patient presents with folliculitis, pneumonia, necrotising fasciitis and a carbuncle. The pathogen displays no resistance. What would you prescribe?
Staph Aureus
flucloxacillin
What virulence factor is responsible for toxic shock syndrome for a staph aureus infection?
Staph Aureus
TSS exotoxin
What virulence factor is responsible for scalded skin syndrome?
Staph Aureus
exfoliative toxin
A patient presents with osteomyelitis, endocarditis, necrotising fasciitis and a furuncle.The patient was given flucloxacillin but his symptoms were not resolved. what mechanism was responsible for this resistance?
Staph Aureus
altered pbp-2a binding site
A patient presents with osteomyelitis, endocarditis, gastroenteritis and a furuncle. Would you treat his gastroenteritis with Abx? why?
No - it is caused by a preformed toxin and Abx treatment would allow for increased toxin release
what is nikolsky’s sign?
low pressure shedding of necrotic epidermis in scalded skin syndrome.
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What pathogen is most likely responsible for this presentation?
staph epidermidis
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What do you expect to see on the gram stain?
staph epidermidis
gram +ve cocci in clusters
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What is the expected result of a catalase test for this causative pathogen?
staph epidermidis
catalase +ve
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What is the expected result of a coagulase test for this causative pathogen?
staph epidermidis
coagulase -ve
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What is the expected result of a novobiocin test for this causative pathogen?
staph epidermidis
susceptible
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What agar would facilitate the growth of this causative pathogen and what would be observed?
staph epidermidis
blood agar - white/ grey
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. How would you treat this patient?
staph epidermidis
vancomycin or teicoplanin
remove catheter or prosthetic material
A patient presents with endocarditis, ventriculitis, peritonitis and has a catheter in. What Abx resistance is displayed?
staph epidermidis
intrinsically resistant to flucloxacillin
A patient presents with dysuria, increased frequency and a lower UTI with cystitis. What pathogen is most likely responsible for this presentation?
Staph saprophyticus
A patient presents with dysuria, increased frequency and a lower UTI with cystitis. What do you expect to see on the gram stain?
Staph saprophyticus
gram +ve cocci in clusters
A patient presents with dysuria, increased frequency and a lower UTI with cystitis. What is the expected result of a catalase test for this causative pathogen?
Staph saprophyticus
catalase +ve
A patient presents with dysuria, increased frequency and prostatitis. What is the expected result of a coagulase test for this causative pathogen?
Staph saprophyticus
coagulase -ve
A patient presents with dysuria, increased frequency and prostatitis. What agar would facilitate the growth of this causative pathogen and what would be observed?
Staph saprophyticus
blood agar - white/ grey
A patient presents with dysuria, increased frequency and prostatitis. What is the expected result of a novobiocin test for this causative pathogen?
Staph saprophyticus
resistant
A patient presents with dysuria, increased frequency and a lower UTI with cystitis. How would you treat this patient?
Staph saprophyticus
Trimethoprim
A patient presents with pharyngitis, scarlet fever (blanching, sandpaper textured rash), impetigo and otitis media. What pathogen is most likely responsible for this presentation?
strep pyogenes
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. What is the expected result of a catalase test for this causative pathogen?
strep pyogenes
catalase -ve
A patient presents with pharyngitis, scarlet fever (blanching, sandpaper textured rash), impetigo and otitis media. What is the expected result of a bacitracin test for this causative pathogen?
strep pyogenes
bacitracin sensitive or susceptible
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. What do you expect to see on the gram stain?
strep pyogenes
gram +ve cocci in chains
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. What is the expected result of a ASOT test for this causative pathogen?
strep pyogenes
ASOT +ve (streptolysin O)
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. How would you treat this patient?
strep pyogenes
IV Benzylpenicillin
What virulence factor is responsible for toxic shock syndrome in a strep pyogenes infection?
strep pyogenes
Pyrogenic exotoxin
What virulence factor is responsible for necrotising fasciitis in a staph aureus infection?
staph aureus
PVL
What virulence factor is responsible for necrotising fasciitis in a strep pyogenes infection?
strep pyogenes
M Protein
method of acquisition of staph aureus?
ingestion (fecal-oral) for gastroenteritis
direct contact
method of acquisition of staph epidermidis?
medical device contamination
method of acquisition of staph saprophyticus?
direct skin contact
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. What is the method of acquisition of this causative pathogen and what precautions should be taken?
strep pyogenes
inhalation and droplet transmission
droplet precaution
isolation for first 24 hours of Abx therapy
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. what haemolysis is observed and what agar was used?
strep pyogenes
Beta on blood agar (clear)
A patient presents with cellulitis, necrotising fasciitis, acute rheumatic fever and glomerulonephritis. What is the expected result of the lancefield test for this causative pathogen?
strep pyogenes
group A
A neonate presents with sepsis and meningitis. The causative pathogen was found to be bacitracin resistant. what is this pathogen and how is it transmitted? what gram stain is expected?
strep agalactiae - congenital (vertical)
gram +ve cocci in chains
A neonate presents with sepsis and meningitis. The causative pathogen was found to be bacitracin resistant. What is the expected result of the lancefield test for this causative pathogen?
strep agalactiae
group B
A neonate presents with sepsis and meningitis. The causative pathogen was found to be strep agalactiae. What is the expected result of the bacitracin test for this causative pathogen?
strep agalactiae
resistant
A neonate presents with sepsis and meningitis. The causative pathogen was found to be bacitracin resistant. what haemolysis is observed and what agar was used?
strep agalactiae
Beta on blood agar (clear)
A neonate presents with sepsis and meningitis. The causative pathogen was found to be bacitracin resistant. How would you treat this patient?
strep agalactiae
IV Benzylpenicillin
A patient presents with CAP, sinusitis, meningitis and otitis media. What is the causative pathogen?
strep pneumoniae
A patient presents with CAP, sinusitis, meningitis and otitis media. What haemolysis is expected and what agar is used?
strep pneumoniae
alpha on blood agar (green)
A patient presents with CAP, sinusitis, meningitis and otitis media. What is the gram stain observed
strep pneumoniae
gram +ve diplococci
A patient presents with CAP, sinusitis, meningitis and otitis media. what is the expected result of an optochin test?
strep pneumoniae
sensitive
A patient presents with CAP, sinusitis, meningitis and otitis media. what is the bile solubility of this pathogen?
strep pneumoniae
bile soluble
A patient presents with CAP, sinusitis, meningitis and otitis media. How is this pathogen transmitted?
strep pneumoniae
inhalation/ droplet
A patient presents with CAP, sinusitis, meningitis and otitis media. What is the expected result of a catalase test for this causative pathogen?
strep pneumoniae
catalase -ve
A patient presents with CAP, sinusitis, meningitis and otitis media. how would you treat this patient’s CAP?
strep pneumoniae
macrolide (clarithromycin)
A patient presents with CAP, sinusitis, meningitis and otitis media. how would you treat this patient’s meningitis?
strep pneumoniae
ceftriaxone
A patient presents with CAP, sinusitis, meningitis and otitis media. what vaccine is recommended?
PCV-13 (children)
PPV-23 (adults)
A patient presents with CAP, sinusitis, meningitis and otitis media. What Abx resistance is displayed by this pathogen and what is the mechanism of resistance?
B-lactams
altered pbp2
a patient presents with an alpha haemolytic strep which is optochin resistant. what is the pathogen?
strep viridans
a patient presents with strep viridans. what is the result of the optochin test?
strep viridans
resistant
which strep viridans is responsible for causing colon cancer?
strep bovis
which strep viridans is responsible for causing dental problems?
strep mutans
which strep viridans is responsible for causing infective endocarditis?
strep mitis
Is strep viridans encapsulated?
nope
a patient presents with aspiration pneumonia, an intraabdominal abscess and pelvic inflammation. this strep is anaerobic. what is the pathogen?
peptostreptococcus
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. what is the causative pathogen?
enterococci
what agar is used to grow enterococci? what is special about this agar?
enterococci
macConkey agar - 6.5% NaCl
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. What is the expected gram stain?
enterococci
gram +ve cocci in short chains
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. what is the result of the oxidase test?
enterococci
-ve
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. what is the result of the catalase test?
enterococci
-ve
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. what is the result of the coagulase test?
enterococci
-ve
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. how would you treat this patient empirically?
enterococci
amoxicillin
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. how would you treat this patient if the pathogen was B lactam resistant?
enterococci
vancomycin
A patient presents with a UTI, infective endocarditis and a wound infection. the pathogen is bile soluble and grows on MacConkey agar. how would you treat this patient if the pathogen was VRE?
enterococci
linezolid
which patients are at increased risk of acquiring and enterococci infection? (taking certain Abx)
enterococci
cephalosporin or an aminoglycoside
method of acquisition of enterococci?
contact
ingestion (fecal-oral)
A patient presents with a UTI with cystitis and peritonitis. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what is the most likely causative agent?
e coli
A patient presents with a UTI with cystitis and peritonitis. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what is this pink colour?
e coli
lactose fermentation
A patient presents with a UTI with cystitis and peritonitis. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what is the expected result from a catalase and coagulase test?
e coli
catalase -ve
coagulase +ve
A patient presents with a UTI with cystitis and peritonitis. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what is observed on the gram stain?
e coli
gram -ve bacilli
A patient presents with gastroenteritis with watery diarrhea. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what is the expected pathogen?
e coli
ETEC
A patient presents with gastroenteritis watery diarrhea. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. What body site is this pathogen found?
ETEC
small intestine
A patient presents with gastroenteritis watery diarrhea. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what virulence factor causes this presentation?
ETEC
heat labile or cholera exotoxin
A patient presents with gastroenteritis with bloody diarrhea and vomiting. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what is the expected pathogen?
VTEC (O157:H7)
A patient presents with gastroenteritis with bloody diarrhea and vomiting. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. What body site is this pathogen found?
VTEC (O157:H7)
colon
A patient presents with gastroenteritis with bloody diarrhea and vomiting. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. what virulence factor causes this presentation?
VTEC (O157:H7)
shiga exotoxin
heat labile and/or stable
what pathogen causes hemolytic uremic syndrome?
VTEC (O157:H7)
what virulence factor of e coli is responsible for causing neonatal meningitis?
K antigen (capsule)
A patient presents with VAP and a UTI. An endotracheal aspirate was sent to the lab and a pink colour was observed on macconkey agar. what is the most likely causative agent and the gram stain?
klebsiella pneumoniae
gram -ve bacilli
A patient presents with a lower UTI with cystitis and peritonitis. a urine sample is sent to the lab and plated on Macconkey agar. a pink colour was observed. how would you treat this patient?
E coli
co-amoxiclav and cefuroxime
lower UTI - trimethoprim
complicated UTI - gentamicin and cefuroxime
A patient presents with VAP and a UTI with cystitis and red jelly-like sputum. is this pathogen motile?
klebsiella pneumoniae
NOPE
A patient presents with necrotising VAP and a UTI with cystitis and red sputum. what agar would this pathogen be grown on?
klebsiella pneumoniae
MacConkey
A patient presents with necrotising VAP and a UTI. An endotracheal aspirate was sent to the lab and a pink colour was observed on macconkey agar. what does this pink colour indicate?
klebsiella pneumoniae
lactose fermenting
A patient presents with VAP and a UTI with cystitis and red jelly-like sputum. How would you treat this patient?
klebsiella pneumoniae
Amoxicillin or co-amoxiclav (empiric)
fluoroquinolone
is e coli encapsulated?
YES
is klebsiella pneumoniae encapsulated?
YES you bitch - mucopolysaccharide capsule
klebsiella pneumoniae is developing resistance to B lactams including cephalosporins. what is this mechanism of resistance?
ESBL
A patient presents with a UTI and renal calculi. he has a catheter in place. The cultures have a fishy smell. what is the expected pathogen and gram stain?
Proteus mirabilis
gram -ve bacilli
A patient presents with a UTI and renal calculi. he has a catheter in place. The cultures have a fishy smell. what is expected on macConkey agar?
Proteus mirabilis
non-lactose fermenting (colourless)
A patient presents with a UTI and renal calculi. he has a catheter in place. The cultures have a fishy smell. What is expected on blood agar? Why?
Proteus mirabilis
Swarming (concentric circles) due to peritrichous flagella
A patient presents with a UTI and renal calculi. he has a catheter in place. The cultures have a fishy smell. How would you treat this patient?
Proteus mirabilis
co-amoxiclav or cefuroxime
what is the result of a catalase test of klebsiella?
+ve
what is the result of a catalase test of proteus?
+ve
is proteus mirabilis encapsulated?
YEEE