Gram Pos Cocci
Streptococci can be differentiated from Staphylococci by the __________ test. This is because Staphylococci have an enzyme that protects them from _________
Catalase , H202
Which Enterobacteriaciae are non motile
Shigella, Klebsiella and Yersinia
a pale staining strict anaerobic GNB with round ends grows in 20% bile, is resistant to colistin, kanamycin and vancomycin and is the most commonly isolated anaerobe?
Bacteroides fragilis
Clue cells from a cervical smear are indicative of
Gardnerella vaginalis
The ONPG test looks for the presence of an enzyme that determines if an organism is classified as what ?
Lactose fermenter
A CAMP test positive reaction where the zone of hemolysis is arrowhead shaped is presumptively positive for :
Group B strep ( S. agalactiae )
Which 3 Enterobacteriacea are positive for Deaminase activity?
Proteus sp, Providencia sp, Morganella sp
cause of pseudomembranous colitis and mega colon
C. difficile
What gene are we detecting when using DNA based testing for MRSA ?
mecA
Kovacs / Ehrlich reagent is used in what test?
Indole
A nonhemolytic GPC is recovered from blood cultures. On Blood agar it is catalase negative, bile esculin positive and NaCl negative , PYR negative. What is the most likely organism?
The test used primarily to differentiate:
E. coli and Klebsiella oxytoca (+) from Klebsiella pneumoniae (-)
Indole
This anaerobic GPC is SPS sensitive and therefore will not grow in blood culture bottles
Peptostreptococcus
Hemophilus influenza grows on chocolate but only grows on Blood agar if another organism supplies what?
V factor
Whats the best screening test for H. pylori?
Urease
This organism is Normal Skin flora and the most common contaminant found in blood cultures. However it has been implemented in infections of immunocompromised, especially after prosthetic heart valve implantation.
Staph epidermidis
Typhoid fever can be caused by 2 different bacteria . Name them and how we differentiate them
Salmonella typhi - H2S +
Salmonella paratyphi - H2S -
which organism is the cause of gas gangrene and grows on egg yolk agar?
Clostridium perfringens
a patient diagnosed with a mild case of pneumonia does not get better after 10 days of a beta lactam antibiotic .. what is the most likely explanation?
a sugar used to differentiate between the species of Neisseria is ?
Maltose :
What is being tested for in the rapid latex agglutination test for Staph Aureus ?
Protein A and Clumping Factor
An infection with this bacteria can often times mimic appendicitis. We can use selective media for it that includes
Yersinia entercolitica
anaerobic GNB that have red fluoresence and are asaccharolytic-
Porphyromonas
What is nutritionally needed for strep to grow ?
Vitamin B6
on the triple iron sugar test E. coli will be ?
A/A yellow/yellow