8. What type of bacteria are in the genus Clostridium? A. Anaerobic cocci B. Spo

Question

8. What type of bacteria are in the genus Clostridium? A. Anaerobic cocci B. Spore-forming anaerobic bacilli C. Spore-forming anaerobic cocci D. Anaerobic bacilli 9. An elderly patient in a nursing home is recovering from bacterial pneumonia. The patient has been on a lengthy regiment of antibiotics to kill the organism causing the disease. A few days later, the patient is diagnosed with pseudomembranous colitis. What organism is the most likely cause? A. Clostridium difficile B. C. tetani C. C. perfringens D. C. botulinum 10. An immunosuppressed patient notices sinus tracts that are draining pus. He also notices that there appear to be small, hard "nuggets" in the pus. What disease will his doctor most likely diagnose? A. Gas gangrene B. Pseudomembranous colitis C. Actinomycosis D. Myonecrosis 11. The four major groups of anaerobic gram-negative bacilli include all the following except A. Bacteroides fragilis. B. Porphyromonas. C. Prevotella. D. Mobiluncus. 12. What are two important factors that must be taken into consideration when transporting specimens for anaerobic culture? A. Making sure there is enough specimen in a tightly closed container B. Minimizing exposure to oxygen and preventing drying out C. Minimizing exposure to oxygen and making sure the specimen is transported in a tightly closed screw-cap container D. Drying out and proper nutrition 13. Which of the following is considered a better specimen for anaerobic culture than a swab? A. Aspirate B. Washing C. Scraping D. Lavage 14. A gram negative rod was isolated from a wound infections caused by a bite from a pet rabbit. The following characteristic reactions were seen: Oxidase production positive Glucose OF fermentative Catalase production positive Motility negative Mac Conkey agar no growth Which of the following is the most likely organism? a. Pasteurella multocida b. Aeromonos hydrophilia c. Vibrio alginolyticus d. Yersinia pestis

Explanation / Answer

1.Clostridium genus contain obligate anaerobic bacteria which are rod shaped and can produce endospores. Hence option B is correct.

2. Clostridium difficile is caustive organism and infect as a result of antibiotics. Hence Option A is correct.

Actinomycosis - which is caused by actinomyces species generally by Actinomyces israelii or A. gerencseriae. Option C is right.

4. All the three are groups of anerobic bacteria bacilli but Bacteroides fragilus is a species of Bacteroides genus and is also gram negative rod shaped. Option A is correct.

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