A catalase-positive, gram-positive short rod, was recovered from the blood of a prenatal patient.  The organism appeared on a 5% sheep blood as white colonies surrounded by a small zone of beta hemolysis.  The following tests were performed, indicating the patient was infected with which organism? Motility= positive (tumbling on wet prep) room temperature; Motility = positive (umbrella shaped on semisolid agar) room temperature; Glucose= positive (fermentation); Esculin = positive; VP – positive.

If a pinpoint colony on blood agar after 24 hours of incubation is isolated, and if the colony is oxidase-, urease-, and indole-negative, and also exhibits bipolar staining on Gram stain, then the suspect bioterror agent is most likely:

A positive Simmons citrate test is seen as a:

Mycobacteria stained by the Ziehl-Neelsen or Kinyoun methods with methylene blue counterstain are seen microscopically as:

Which of the following is the best technique to identify Dientamoeba fragilis (a parasite) in stool?

“Clue cells” are seen on a smear of vaginal discharge obtained from an 18-year old female ER patient. This finding, along with a fishy odor (amine) after the addition of 10% KOH, suggests bacterial vaginosis caused by which organism?

An anaerobic medium, LKV blood agar, is for this purpose:

Patients receiving lipid-supplemented parenteral nutrition are at risk for developing fungemia caused by which organism?

What concentration of sodium hydroxide (NaOH) is used to prepare a working decontamination solution for the processing of not normally sterile specimens for mycobacteria?

The salt tolerance test (6.5%) salt broth is used to presumptively identify: