Micro Practice

An alteration in the amount and types of normal flora organisms, as caused by broad-spectrum antibiotic use, may result in an overgrowth of which of the following?

A growth factor test for the identification of Haemophilus parainfluenzae would show growth around

Which of the following is a characteristic of Campylobacter jejuni?

Contaminated contact lens cleaning solutions have been implicated as the source of serious eye infections caused by

The description of an oval, budding yeast surrounded by a wide polysaccharide capsule best describes which of the following?

All the following are known to be a cause of diarrhea EXCEPT

The coagulase test, which demonstrates the ability of bacteria to cause plasma to clot, is used to distinguish

A colon cancer patient who had abdominal surgery developed fever and abdominal pain several days post-op. Peritonitis was suspected. Which of the following are the most likely causative agents?

Infection with which of the following enteric organisms is most likely to cause bacteremia?

Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae are organisms associated with bacterial meningitis. What is the most important virulence factor that they share?

What is the most common cause of pharyngitis?

Ticks transmit all the following diseases EXCEPT

Which of the following viruses is characterized by a period of latency?

Which of the following viruses does not possess RNA polymerase in its virion?

An aerobic. gram-negative coccobaccillus was isolated on blood agar from a nasopharyngeal swab 48 hours after culture from a 6-month-old infant with suspected pertussis. The organism exhibited the following characteristics. Urea- negative at 4 hours, positive at 18 hours Oxidase-negatve Catalase-positive Citrate-positive Small zones of beta hemolysis Slight brownish coloration of the medium The most probable isolate is:

Which of the following is the best aid in the identification of Epidermophyton floccosum macroconidia?

Of the following, the organism MOST commonly isolated from spinal fluid of children less than 5-years of age is:

Blood cultures from a case of suspected leptospiremia should be drawn:

A two-week-old culture of a urine specimen produced a few colonies of acid-fast bacilli which were rough and nonpigmented. The niacin test was weakly positive and the nitrate test was positive. Which of the following is the most appropriate action when a presumptive identification has been requested as soon as possible?

The preferred specimen for laboratory diagnosis of acquired cytomegalovirus infection is:

The macro-broth dilution method for determining antibiotic susceptibility of the Enterobacteriaceae cannot be used effectively for the sulfonamides or trimethoprim because:

A jaundiced 7-year-old boy, with a history of playing in a pond in a rat-infested area, has a urine specimen submitted for a direct darkfield examination. Several spiral organisms are seen. Which of the following organisms would most likely be responsible for the patient's condition?

Candida albicans differs from other Candida species in that Candida albicans:

An isolate from a stool culture gives the following growth characteristics and biochemical reactions: MacConkey Agar: colorless colonies Hektoen Agar: yellow-orange colonies TSI: acid slant/acid butt, no gas, no H2S Urea: positive These screening reactions are consistent with which of the following enteric pathogens?

The Epstein-Barr virus is associated with which of the following: