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The standard inoculum of bacteria to be used in disk diffusion antimicrobial-susceptibility testing can be created by the use of a

“Clue cells” seen in a malodorous vaginal discharge are associated with a diagnosis of bacterial vaginosis; vaginal culture typically shows a predominance of

Only Influenza A virus is known to undergo antigenic shift

Special handling or methods are required when blood cultures are requested on a patient to recover any of the following organisms EXCEPT

Clinical laboratories handling mycobacteria fall into this biosafety level.

Safety precautions designed to minimize laboratory-acquired infections when working with Mycobacterium tuberculosis in a clinical laboratory would prevent spreading of these organisms by

A stool specimen is submitted for culture from a patient with gastroenteritis, nausea, and vomiting. A gram-negative rod grows on TCBS agar as a large green colony type. Additional screening characteristics include:TSI: K/A, H2S negNutrient broth with 0% NaCl: no growthNutrient broth with 3% NaCl: growthThe most probably presumptive identification of this isolate is

It is important to differentiate between Enterococcus and Group D Streptococci because 

Characteristics of the HACEK group of bacteria include

Bacteria that are glucose oxidizers in Hugh-Leifson (H-L) O-F medium produce an alkaline/no change reaction in Triple sugar iron (TSI) because