All of the organisms in the Enterobacteriaceae are oxidase ________.

Mycobacterium tuberculosis stains readily with: a. Gram’s stain b. Papanicolaou stain c. Ziehl-Neelsen stain d. Wayson’s stain

39. Which of the following is most important to prevent the spread of infection?  (Coronavirus 😉 a. wearing a buttoned, clean cotton laboratory coat at all times in the laboratory b. using antiseptic cleaner to wash the countertops after completion of work c. double gloving when performing procedures that have a likelihood of blood splashing d.   washing hands vigorously with germicidal soap and water.    

A TSI slant with Pseudomonas aeruginosa growing on it will give a ___ reaction.

A bacteria that produces a characteristic purple pigment

40. A Staphylococcus species recovered from a wound (cellulitis) was negative for the slide coagulase test (clumping factor) and negative for novobiocin resistance.  The next test(s) needed for identification is (are): tube coagulase test beta-hemolysis on blood agar mannitol-salt agar plate all listed answers 

Which of the following is the media of choice for growing Legionella spp.?

  18. A test for the hydrolysis of esculin in the presence of bile is especially useful in identifying species of the genus _____. 1. Haemophilus    2. Neisseria 3. Enterococcus                4. Staphylococcus

Twenty patients on a surgical ward develop urinary tract infections after catheterization.  In each instance, the isolated organism grows sheep blood agar as a large, gray colony, and on MacConkey agar as a large, flat, pink colony.  The oxidase-negative, gram-negative rod produces the same biotype and is resistant only to tetracycline.  Additional biochemical results are as follows:               Phenylalanine deaminase (PAD): negative             Urease: negative             Hydrogen sulfide (H2S): negative             Lysine decarboxylase: positive             Ornithine decarboxylase: positive             Indole: positive             Citrate: negative

12. What is the purpose of making cuts in the sheep blood agar when a throat culture is plated? To count the colonies growing after incubation To observe the appearance of any hemolysis present To determine whether the organism is lactose positive or negative To note the morphologic appearance of the colony growth