MICROBIOLOGY EXAM 2023|2024 UPDATE

1. Which of the following tests can be utilized to differentiate Morganella from Providencia? A. Phenylalanine Deaminase and Lysine Deamination B. Indole test and Vogues-Proskauer C. Citrate and Gas production D. Lactose fermentation and Methyl Red test 2. An oxidase negative coccobacillus isolated from a urine specimen grows well on MacConkey, giving a purplish hue. It is resistant to many antimicrobials. a. Pseudomonas b. Acinetobacter c. E. coli d. Neisseria 3. A gram-negative bacillus has been isolated from feces and the confirmed biochemical reaction fit those of Shigella. The organism does not agglutinate in Shigella antisera. What should be done? a. Test the organism with a new lot antisera b. Test with the Vi antigen c. Repeat the biochemical testd. Boil the organism and retest with the antisera