Question

CASE STUDY #3 Scout troop went camping in rural Colorado. After a long day of hiking, the boys went swimming in a pool frequently used by several different troops in the area. The next week, four of the boys developed diarrhea. Their stools had an unusual foul smell, a greasy appearance and light density. Their stools appeared fatty but were neither bloody nor mucous. The ill boys also experienced nausea, vomiting and fever. 12. The organism most likely responsible for the illnesses is (a) Entamoeba histolytica (b) Giardia lamblia (c) Trichomonas vaginalis (d) Shigella dysenterias (e) Ascaris lumbricoides 13. The most probable source of infection was exposure to (a) untreated contaminated water (b) soil-borne pathogens (c) aerosolized organisms (d) insect-borne pathogens (e) a zoonotic illness 14. The specimen most useful for laboratory diagnostic purpose is (a) blood (b) sputum (c) cerebrospinal fluid (d) urine (e) feces 15. A microscopic examination of specimen would reveal (a) gram-positive budding forms (b) long 1 x20 jum worms (c) proglottids with 15-20 uterine branches (d) trophozoites with eye-like structures (e) gram-negative rod-shaped bacteria

Answer 1

12 Ans. b. Giardia lamblia

13 Ans. a. Untreated contaminated water

14 Ans. e. feces

15 Ans. d. trophozoites with eye-like structures

16 Ans. a. duodenum, jejunum and upper ileum

17 Ans. d. imidazole