Bacteriology Flashcards
The gold color of S. Aureus is due to the pigment
Staphylotoxin
Habitat of s. Aureus
Anterior nares
Beta hemolytic bacteria
S. Aureus
S. Pyogenes
S. Agalactiae
Listeria
Immunimodulator in S. aureus responsible for preventing complement activation
Protein A
Immunimodulator of S. aureus specific for WBC
Panton valentine leukocidin
Other name of hyaluronidase
Spreading factor
Toxin of staph aureus responsible for epidermal separation
Extoliatin
Toxin of s. Aureus that causes necrosis of the skin and hemolysis
Alpha toxin
Differentiate impetigo in staph and strep
Staph aureus - impetigo bullosa
strep - impetigo contagiosa
Most common cause of acute endocarditis
Staph aureus
Sequestered focus of osteomyelitis arising in the metaphyseal area of long bones
Brodie abscess
MC Cause of septic arthritis
Staph aureus
Most common cause of septic arthritis in sexually active people
N. Gonnorhoea
Mechanism of exfoliatin in SSSS
Exfoliatin cleaves desmoglein in desmosomes
In ritter disease, separation of the epidermis happens in what layer? In TEN?
Stratum granulosum
Dermo-epidemoid junction
Toxic shock syndrome is due to what toxin
TSST-1
Unique to toxic shock syndrome of staph compared to strep
No demonstrable focus and blood cs is negative
Usual risk factor/scenario in staph aureus TSS
Tampon-using
Nasal packing
Heirarchy of treatment of S.aureus
MSSA - penicillinase resistant penicillins (nafcillin, oxacillin,dicloxacillin)
MRSA- vancomycin
VRSA - linezolid
Morphology of staph epid in blood agar
Whitish
Non-hemolytic
Previously called staphylococcus albus
Mnemonic for novobiocin sensitivity
NO StRES
Novobiocin
Saprophyticus resistant
Epidermidis sensitive
Staph epid contains ____ that makes it adhere well to foreign bodies
Glycocalyx
Most common cause of prosthetic valve endocarditis/septic arth in prosthetic joints/VP shunts
S. epidermidis
Treatment of staph epid
Vancomycin (50% are resistant to Methicillin)
Treatment for catalase pos, coagulase neg bacteria
Vancomycin
2nd most common cause of UTI in sexually active women
S. Saprophyticus
Treatment for Staph saprophyticus
TMP-SMX
QUINOLONES
Catalase negative
Alpha hemolytic
Bile optochin sensitive
S. Pneumoniae
Catalase negative
Alpha hemolytic
Bile optochin resistant
Viridans streptococci
Catalase negative
Beta hemolytic
Bacitracin sensitive
S. Pyogenes
Catalase negative
Beta hemoytic
Bacitracin resistant
S. agalactiae
Catalase negative
Gamma hemolytic
Group D strep
Group A and Group B in strep are named ____ grouping
Lancefield grouping
A positive PYR test for a streptococci rule in
S. pyogenes and group D streptococci
Mnemonic for bacitracin sensitivity
B-BRAS
Bacitracin
B strep - resistant
A strep sensitive
Other name of DNase in strep pyogenes?
What is its function?
Streptodornase
Degases DNA in exudates or necrotic tissue
Toxin thag produced scarlet fever
Erythrogenic toxin
Oxygen labile and oxygen stable toxins of strep
Streptolysin O - oxygen labile
Streptolyson S - oxygen stable
Superantigen found in strep similar to TSST-1
Pyogenic exotoxin A
Protease that rapidly destroys tissue causing necrotizing fasciitis in strep pyogenes
Exotoxin B
Documents antecedent skin infection for s. Pyogenase
Anti-DNase B
In impetigo contagiosa, neutrophils accumulate in what layer of the epidermis?
Beneath the stratum corneum
Cellulitis is facilitated by what factor in strep pyogenes?
Spreading factor or hyaluronidase
Necrotizing fasciitis is facilitated by what toxin in strep pyogenes
Exotoxin B
Most common bacterial cause of sore throat
S pyogenes
Characteristic of rash in scarlet fever
Sandpaper rash
Found on armpits and inguinal area in scarlet fever
Pastia’s lines
Susceptibility test for scarlet fever
Dick test
In streptococcal toxic shock syndrome, there is no demonstrable focus and blood cs is usually negative. t or F
F
PSGN is most common post pharyngitis or post impetigo?
Postimpetigo
DoC in GABHS
Penicillin G
GBS can hydrolyze
Hippurate
Habitat of GBS
Vagina
Test to identify GBS
CAMP test
GBS can be cultured using what broth
LIM broth
Most common cause of neonatal meningitis
GBS
Drug of choice in GBS
Penicillin G
All pregnant women should be screened for GBS at what AOG
35-37 weeks
Chemoprophylaxis with what 4hrs prior to delivery should be done for GBS
IV penicillin
Ampicillin
4 hrs prior to delivery
group D strep hydrolyzes
Esculin
BEA - bile esculin agar
How do you differentiae E. Faecalis from s. Bovis?
E faecalis can grow in 6.5% NaCl
S. bovis does not
Endocarditis for patients who underwent GI surgery is usually due to
E. faecalis
_____ endocarditis is seen in patients with abdominal malignancy due to S. bovis
Marantic endocarditis
Lancet shaped cocci
Strep pneumoniae
Strep pneumonia is positive in what reaction
Quellung reaction
Mnemonic for optochin sensitivity
OVERPAS
Optochin
Viridans resistant
Pneumoniae sensitive
Mnemonic for Quellung reaction
Quellung- capsular swellung
Mnemonic for encapsulated bacteria
Some killers have pretty nice and shiny bodies
Strep pneumoniae Klebsiella Haemophilus influenza Pseudomonas aeruginosa Neiserria meningitidis Salmonella typhi B group streptococci
In strep pneumoniae, ____ reacts with CRP, ___ is for colonization, and ____ retards phagocytosis
C-substance
IgA protease
Capsule
Carrier protein of conjugated vaccine for pneumonia
Diphtheria toxoid
Viridans streptococci is a group if bacteria composed of
S. Mutans
S. Sanguis
S intermedius
Viridans strep implicated in dental caries
S mutans
Mnemonic for bile optochin resistance
Viridans strep live in the mouth hence they are not afraid OP THE CHIN (optochin resistant)
Viridans strep impliated in subacute bacterial endocarditis
S. Sanguis
Viridans strep implicated in brain abscess
S intermedius
Spore forming genus in gram positive rods
Clostridium
Bacillus
Aerobic non motile box car shaped gram positive rod
Bacillus anthracis
Spore forming gram positive rod
Anaerobic
Tennis racket like
Clostridium tetani
Type of paralysis in tetanus vs botulinum
Spastic - tetanus
Flaccid - botulinum
Medusa head morphology
Bacillus anthracis
Gram positive rod
Double hemolysis
Clostridum perfringens
Agar for clostridium perfringens
Egg yolk agar