In the disk diffusion method of determining antibiotic susceptibility, the size of the inhibition zone used to indicate susceptibility is determined by:

All of the following are ways to identify viruses EXCEPT:

Which organism is susceptible to optochin?

Upon review of a sputum gram stain, the technician notes that all the neutrophil nuclei in the smear are stained dark purple. The best explanation for this finding is:

The procedure that assures the most accurate detection of mecA-mediated oxacillin resistance in routine broth microdilution susceptibility testing against S. aureus is:

A patient is seen in urgent care complaining of a terrible sore throat.  A rapid strep test is performed and found to be negative.  What is the appropriate next step?

This organism is said to have “umbrella” motility

What is the hemolysis results for Streptococcus pyogenes?

The MacConkey (MAC) plate is considered what type of media?

A light yellow colony from a skin lesion grew aerobically and tested as catalase positive and coagulase negative. The gram stain showed gram positive cocci in clusters and was modified oxidase positive, bacitracin susceptible. What is the most likely identification of this organism?