Chapter 25 MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 Which of the following is mismatched A hookworm infestation parasite bores through skin B hydatid disease humans are the definitive host C pinworm infestation humans ingest parasite s eggs D Taenia infestation humans are the definitive host E trichinellosis humans eat larva of parasite Answer B 2 Many bacterial infections of the lower digestive tract are treated with A quinacrine B thorough cooking C antitoxin D water and electrolytes E penicillin Answer D 3 Typhoid fever differs from salmonellosis in that in typhoid fever A infection is spread only in the feces of domesticated animals B infection occurs due to ingestion of endospores C the microorganisms multiply within macrophages D the incubation period is much longer E the symptoms are due to infection of the gallbladder Answer D 4 All of the following pertain to pinworm infections EXCEPT A transmission is typically by contact with fomites or inhalation of eggs B it is most commonly transmitted by cysts in water C it is a helminth disease D all family members living with the patient must also be treated E diagnosis is by detecting eggs on transparent tape pressed to the perianal area Answer B 5 Poultry products are a likely source of infection by A Salmonella enterica B Helicobacter pylori C Shigella spp D Clostridium perfringens E Vibrio cholerae Answer A 1 6 All of the following are eukaryotic organisms that cause diarrheal disease EXCEPT A Entamoeba B Cryptosporidium C Campylobacter D Cyclospora E Giardia Answer C 7 Acute gastroenteritis that occurs after an incubation period of two to three days and commonly affects children is probably caused by A Salmonella B Giardia C Staphylococcus aureus D Trichinella E rotavirus Answer E 8 All of the following infections can result from drinking contaminated water EXCEPT A giardiasis B cryptosporidiosis C Cyclospora infection D cholera E trichinellosis Answer E 9 Dental plaque is an example of A gingivitis B dentin C tooth enamel D a pellicle E a biofilm Answer E Situation 25 1 Following a county fair 160 persons complained of gastrointestinal symptoms Symptoms included diarrhea 84 percent abdominal cramps 96 percent nausea 84 percent vomiting 82 percent body aches 50 percent fever 60 percent median body temperature 38 3 C median duration of illness 6 days range 10 hr to 13 days 10 In Situation 25 1 fecal samples should be cultured for all of the following EXCEPT A Campylobacter jejuni B Giardia lamblia C Salmonella enterica D enteropathogenic Escherichia coli E Shigella spp Answer B 2 11 Microscopic examination of a patient s fecal culture shows spiral bacteria The bacteria probably belong to the genus A Escherichia coli B Shigella spp C Campylobacter jejuni D Salmonella typhi E Vibrio cholerae Answer C 12 Which of the following statements about staphylococcal food poisoning is FALSE A It is caused by ingesting an enterotoxin B It can be prevented by adequate refrigeration of food C It is characterized by rapid onset and short duration of symptoms D It is treated by replacing water and electrolytes E It can be prevented by heating foods to 50 C for 15 minutes Answer E 13 Which of the following is directly involved in the initiation of dental caries A crevicular fluid B sucrose C lactic acid D dentin E lysozyme Answer C 14 Thorough cooking of food will prevent all of the following EXCEPT A salmonellosis B shigellosis C beef tapeworm D trichinellosis E staphylococcal food poisoning Answer E Table 25 1 Food Black beans Corn soup Jalape o peppers Roma tomatoes Relative Risk 0 58 0 75 34 13 5 40 15 The relative risks shown in Table 25 1 were calculated for foods suspected of transmitting Salmonella Which food is the most likely source of infection A black beans B corn soup C jalape o peppers D roma tomatoes E The answer cannot be determined based on the information provided Answer C 3 16 Disease causing exotoxins are produced by all of the following organisms EXCEPT A Vibrio cholerae B Clostridium perfringens C Clostridium botulinum D Staphylococcus aureus E Shigella dysenteriae Answer E Situation 25 1 Following a county fair 160 persons complained of gastrointestinal symptoms Symptoms included diarrhea 84 percent abdominal cramps 96 percent nausea 84 percent vomiting 82 percent body aches 50 percent fever 60 percent median body temperature 38 3 C median duration of illness 6 days range 10 hr to 13 days 17 In Situation 25 1 fecal samples were found to be negative when cultured The next step in diagnosing the cause of illness would be A to begin antibiotic therapy B muscle biopsy C microscopic examination of feces for viruses D microscopic examination of fecess for oocysts E blood cultures Answer D 18 Which of the following organisms feeds on red blood cells A Escherichia coli B Giardia lamblia C Vibrio parahaemolyticus D Entamoeba histolytica E Taenia spp Answer D 19 Which of the following diseases of the gastrointestinal system is transmitted by the respiratory route A traveler s diarrhea B staphylococcal enterotoxicosis C bacillary dysentery D Vibrio gastroenteritis E mumps Answer E 20 A vaccine to provide active immunity to HBV is prepared from A viruses grown in tissue culture B genetically modified yeast C viral particles in patients D pooled gamma globulin E viruses grown in embryonated eggs Answer B 4 21 Which of the following correctly lists the stages of tooth decay A decay in dentin plaque accumulation destruction of enamel advancement of decay through enamel decay in tooth pulp B destruction of enamel advancement of decay through enamel plaque accumulation decay in dentin decay in tooth pulp C plaque accumulation destruction of enamel advancement of decay through enamel decay in dentin decay in tooth pulp D plaque accumulation destruction of enamel decay in tooth pulp advancement of decay through enamel decay in dentin E destruction of enamel plaque accumulation advancement of decay through enamel decay in dentin decay in tooth pulp Answer C 22 Which of the following is mismatched A chicken Campylobacter jejuni B eggs Trichinella spirlais C oysters Vibrio parahaemolyticus D beef E coli O157 H7 E custard and cream pies Staphylococcus aureus Answer B 23 Which of the following organisms is likely to be transmitted via undercooked pork and horse A Trichinella spiralis B Staphylococcus aureus C Shigella spp D Salmonella enterica E Entamoeba histolytica Answer A 24