Micro Flashcards
Branching filamentous rods
Nocardia (acid fast, urease +)
actinomyces (anaerobe)
Use of PAS
Whipple’s disease
Chocolate agar growth
H. influenza
Thayer-Martin growth (has vanco/polymyxin/nystatin)
N. gonorrhea or N. menigitidis
Bordet-Genau growth
Bordatella pertussis
Tellurite/Loffler growth
C. diphtheria
Lowenstein-Jensen growth
Mycobacterium tuberculosis
Eaton’s agar growth
Mycoplasma pneumonia
Charcoal yeast extract with cysteine/iron growth
Legionella
Assc with burn wounds
Pseudomonas
Encapsulated organisms (7)
H. flu Strep pneumo N. meningitidis E. coli Salmonella Klebsiella Strep group B
Catalase (+) bugs (7)
pseudomonas listeria aspergillus candida E. coli S. aureus serratia
Sulfur granules on microscopy
Actinoyces israelii
Bug that produces red pigment
Serratia marcescens
Pharyngitis/pseudomembrane
bull neck
C. diphtheria
inactivates EF2
Dysentery
GI mucosal damage
toxin caused
Shigella, shiga toxin
inactivates 60s ribosome
also seen in E. coli 0157:H7
Rice water diarrhea
cholera toxin
increases cAMP by adenylate cyclase
Whooping cough toxin
Pertussis toxin
disables Gi, increases cAMP
Tetanus MOA
toxin inhibits GABA/glycine release
muscle rigidity
Botulinum MOA
toxin prevents release of ACh at NMJ
paralysis
Toxins with A/B type MOA
Cholera toxin and pertussis toxin
B enters cell, A activates
Staph species differentiation
S. aureus-coagulase +
S. epidermidis-novobiocin sensitive
S. saprophyticus-novobiocin resistant
Strep species differentiation
S. pneumo-optochin sensitive, alpha hemolytic
Viridans strep-otpochin resistant, alpha
Group A strep-bacitracin sensitive, beta
Group B strep-bacitracin resistant, beta
S. aureus toxins
TSST-1 toxic shock
scalded skin syndrome
food poisoning
Bug seen on prosthetic heart valves
Staph epidermidis
biofilm
Pneumonia
otitis media
sinusitis
IgA protease (+)
Strep pneumo
rusty sputum
sepsis with sickle cell/splenectomy
optochin sensitive
Dental caries
endocarditis
normal flora
Viridans strep
Strep mutans-caries
S. sanguis-heart valves
resistant to optochin
Arthritis
carditis
nodules sub q
post infection
Strep pyogenes
bacitracin sensitive
ASO titer to detect
also see erythema marginatum and syndenham’s chorea with Rheumatic fever
Rash over the body
red tongue and throat
post infection
Strep pyogenes
Scarlet fever
bacitracin sensitive
toxic shock like syndrome
1 yr/o
Pneumonia
meningitis
Strep agalactia (group B)
seen in babies
bacitracin resistant
Hippurate (+)
Subacute endocarditis
bacteremia
Strept bovis
colon cancer pts
Grayish-white on pharynx
lymphadenopathy of neck
(+) cystine-tellurite growth
C. diphtheria
bullneck/pseudomembrane
EF2 inhibiting toxin
(+) Elek’s test
lecithinase (alpha toxin)
gas gangrene
hemolysis
C. perfringens
causes myonecrosis
Black eschar
bacteremia
edema
cutaneous anthrax
poly D glutamate capsule
lethal factor and edema factor cause eschars
Flu like sx
progresses quickly
mediastinitis
pulmonary hemorrhage
pulmonary anthrax
Woolsorter’s disase-from contaminated wool
Rice and pasta diet
N/V for 5 hrs
watery diarrhea
Bacillus cereus
food poisoning
reheated rice syndrome
High dairy diet
spontaneous abortion in pt
gastroenteritis
Listeria monocytogenes unpasteurized milk/cheese, deli meats tumbling motility moves cell to cell via actin rockets neonatal meningitis
Oral abscess
sulfur granules on microscopy
Actinomyces
normal flora
anaerobic
branching filaments
Pneumonia in immunosuppressed pt
found in soil
nocardia
acid fast
branching filamentous rods
TB virulence factors
cord factor-inhibit Macrophage maturation
sulfatides-inhibit lysosomal fusion
Loss of sensation on feet and hands
no growth on agar
hairless skin plaques
mycobacterium leprae
US armadillos
lepromatous-communicable (Th2), diffuse
tuberculoid-Th1
Differentiation b/t neisseria strains
N. meningitidis- maltose fermenter
N. gonorrhea- maltose nonfermenter
Adrenal gland failure
shock
maltose fermentation
N. meningitidis
rapid necrosis of adrenals
Epiglottitis
otitis media
meningitis
H. influenza
otitis media from nontypeable
cultured on chocolate agar
Elderly man
pneumonia
GI and CNS sx
hx of hotel stay
Legionella pneumophilia gram (-) rod charcoal yeast growth (iron/cystein) water source caused (AC unit) intracellular in macrophages
Folliculitis after in hot tub
also external otitis
exotoxin A
Pseudomonas green/blue pigment smells like grapes cystic fibrosis/hot tub/swimmer's ear/burn assc toxin inactivates EF2
Homeless alcoholic
pneumonia
MacConkey growth
Klebsiella
red currant jelly sputum
diabetics/alcoholics
Rose spots on abd
fever
diarrhea
Slamonella typhi
typhoid fever
Bloody diarrhea in a kid
arthritis
S shaped
lower extremity weakness
Campylobacter jejuni
deli meat/milk
grows at 42 degrees, oxidase (+)
Guillain-Barre syndrome (ascending paralysis)
Rice water diarrhea
dehydration
vibrio cholerae
activates Gs protein
oxidase (+)
dehydration risk
Sx of Crohn’s disease
has new puppy
Yersinia entercolitica
mimics Crohn’s/appendicitis
assc with pet feces/milk/pork
Duodenal ulcers
dx with gastric adenocarcinoma
Helicobacter pylori
urease (+)
tx with PPI, clarithromycin, amoxicillin
Just got back from Hawaii
has jaundice
photophobia
proteinuria
Leptospira interrogans
Weil’s disease (jaundice/azotemia/anemia)
Facial n. palsy
AV block
migratory arthritis
erythema migrans
Lyme disease-borrelia burgdoferi
NE U.S.
bull’s eye rash
encephalopathy can develop
Pupil does not react to light
ataxia
Hx of maculopapular rash on palms/soles
Syphilis-treponema pallidum
VDRL screen, FTA-ABS confirm
painless chancre/maculopapular rash/tabes dorsalis (neurosyphilis)
Child born with deafness
notched teeth
abnormal molars
Congenital syphilis (treponema) Saber shins/CN VIII/Hutchinson's teeth/mulberry molars
Dairy products
fever
muscular pain/swelling
migratory arthralgia
Brucella spp
Brucellosis
Bloody diarrhea
works at pet shop
Campylobacter
puppies/livestock/undercooked meat
Bitten by a cat
swelling around the area
bone pain
Pasteurella multocida
animal bite
cellulitis/osteomyolitis
Overcrowded area
Rash on trunk, spreads out (no palms/soles)
fever/headache
Rickettsia prowazekii
epidemic typhus
body louse vector
Hiker
rash on limbs that spread to trunk
headache/fever
Rickettsia ricketssii
needs CoA and NAD+
Farmer
presents with pneumonia sx
Coxiella burnetii
cattle placenta spores
African immigrant
Recurrent conjunctivitis
irritation of the cornea
no bugs seen on microscopy
Chlamydia trachomatis serotypes A,B,C
follicular conjunctivitis
can lead to blindness
Sexually active female
tenderness/inflammation in pelvis
no bugs seen on microscopy
What serotype?
Chlamydia trachomatis serotypes D-K
urethritis/PID
ectopic pregnancy/neonatal penumonia
Reactive arthritis
urethritis
sexually active
Chlamydia
elementary body enters cell
reticulate body replicates in cell
tx with azithromycin/doxycycline
Pneumonia
pt is mobile and walking
(+) cold agglutinins
grows on Eaton’s agar
Mycoplasma pneumonia
walking pneumonia, contains sterols in membrane
military recruits/prisons
tx with fluoroquiolone or macrolides
Pt lives in Ohio
presents with pneumonia
Has been cave diving in the last month
Histoplasmosis
intracellular in macrophages
bird/bat droppings
Pt lives in Mississippi
granulomatous nodules in bone/skin
pneumonia
Blastomycosis
broad base budding yeast seen
Pt lives in Arizona
Presents with meningitis and pneumonia
Bone/skin involvement
Coccidioidomycosis
Spherules seen
San Joaquin valley/desert
Immigrant recently moved from South America
Captain’s wheel appearance on microscopy
Pneumonia
Paracoccidioidomycosis
In Florida
hypopigmented patches
spaghetti and meatball appearance on KOH prep
Tinea versicolor
Malassezia furfure causes
Pt has asthma sx
sputum production (sometimes blood)
recurrent pulmonary infections
Aspergillus fumigatus
45 degree branching hyphae
type IV HS rxn
can also can Aspergillomas (ball in lung)
AIDS pt
presents with meningitis
(+) latex agglutination test
recently camping
Cryptococcus neoformans
meningitis in AIDS pts
bird droppings
Soap bubble test in brain
Diabetic pt
has acidosis
headaches
necrosis around the nose
Mucor and rhizopus spp keotacidotic diabetics cribriform plate/enters brain black necrotic eschar on face hyphae branching at 90 degrees