A Cluster of Cases of Legionellosis Have Occurred in Your

question 65

Multiple Choice

A cluster of cases of legionellosis have occurred in your neighborhood. People with the illness have cough, fever, shortness of breath, chest pain and sometimes diarrhea. The illness is caused by the bacterium Legionella pneumophila, a facultative intracellular parasite that survives in certain ameba. The organism has an absolute requirement for L-cysteine.
-A modification of the BCYE medium used to culture L. pneumophila is BCYE with DGVP. This medium contains glycine, polymixin B (an antifungal agent) , and and vancomycin (antibiotic) , as well as two dyes (bromocreson purple and bromthymol blue) that facilitate identification of the organism based on colony color. What type of medium is BCYE with DGVP?

• A) Selective
• B) Differential
• C) Selective AND differential
• D) Liquid
• E) Anaerobic

---

Definitions:

Direct Opening

A straightforward beginning to a piece of writing or speech, which clearly states the purpose or main idea from the start.

Formal Research

The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions in a structured and organized manner.

Primary Sources

Original documents, objects, or other materials used directly by witnesses or participants in past events.

Indirect Strategy

An approach to communication where relevant background information and explanations are provided before delivering the main message, often used to soften bad news or persuade.