A significant number of Gram negative bacilli are isolated f…

A significant number of Gram negative bacilli are isolated from the urine of an otherwise healthy 23 year-old woman. The results of the biochemical analysis demonstrate: Phenylalanine deaminase = green after addition of FeCl3 Indole = red ring after Kovac’s Methyl red = red Voges-Proskauer = colorless Arginine dihydrolase = yellow Lysine decarboxylase = yellow Ornithine decarboxylase = yellow Decarboxylase base = yellow TSI = yellow slant, black butt The most likely genus and species of this organism is:

Both sets of blood cultures from a 44 year-old male patient…

Both sets of blood cultures from a 44 year-old male patient (post appendectomy) grew Gram negative bacilli from both the aerobic and anaerobic bottles after 18 hours incubation. Biochemical reactions demonstrate the following: MAC = pink donuts BAP = luxuriant growth TSI = acid / H2S Indole = negative Motility = positive Citrate = positive MR/VP = +/0 Ornithine = negative Lysine decarboxylase = negative PAD = negative The most likely genus and species of this organism is:

A penile discharge is submitted to the microbiology labortor…

A penile discharge is submitted to the microbiology labortory for Gram stain. Upon examination of the Gram stain, you observe many PMN’s and Gram- negative diplococci. Further examination demonstrates that in several fields the diplococci are found intracellularly within PMN’s. Your report to the physician will consist of:

Susceptibility testing performed on quality control organism…

Susceptibility testing performed on quality control organisms using a new media lot number yielded zone sizes that were too large for all antibiotics tested. The testing was repeated using media from a previously used lot number, and all zone sizes were acceptable. Which of the following best explains the unacceptable zone sizes?

A slaughterhouse worker accidentally cut her finger while pr…

A slaughterhouse worker accidentally cut her finger while preparing pork products. She developed a painful, localized, purple-ish/red lesion. A culture from her wound grew Gram positive pleomorphic bacilli on BAP. The organism was non-motile, catalase negative and produced a small amount of H2S in a TSI slant. The most likely cause of her infection is: