FSN 230 Midterm 2 Questions With Complete Solutions

Food Poisoning correct answer: Pathogenic MO's cause food borne illness Food Poisoning is a common term used to describe 2 types of food caused sickness- Food infection and Food intoxication Food Infection correct answer: The living microorganisms must be PRESENT in the food. The person involved must consume very high numbers of the living microorganism. The living microorganism in the gut of the person involved causes the illness 1. Salmonella 2. shigella 3. vibrio 4. trichinella 5. esherichia coli 6. yersinia 7. capylobacter and others (live in microbes-go into guts & attack) more common Food Intoxication correct answer: the living microorganism grows IN THE FOOD and produces some metabolic end product (toxin). The person involved must consume the food that contains the toxin. The microorganism does not have to be present within the person. The person reacts to toxin and becomes ill. 1. staphylococcus 2. clostridium botulinum 3. c. perfinges 4. aspergilus flavus 5. bacillus cereus. Doesnt matter if they're alive just that they made toxin. Can be fatal Food Infection correct answer: a food infection is caused by the ingestion of sufficiently high umbers of a live pathogenic MO. The pathogen grows in the human body rather than in the food. The onset of symptoms is usually longer than for food intoxication (18-24 hours) Frank pathogens= salmonella, shigella, yersinia-- always considered pathogenic Salmonellosis correct answer: 2000+ species, 20000+ cases/year. NON SPORE FORMING, rod shaped, motile, facultative anaerobe, 7-14 day incubation period. Not heat resistant. Optimum growth 37 C-body temp. Usually from shellfish, eggs, milk, raw and uncooked meat. People become carriers. The carrier stage last more than 12 weeks (breathing, mucous). Occurs when food is cooked improperly and held at warm temps. 140 for 5 min =90% destroyed. 140 for 10=99%. 140 for 15=99.9%. If some survive the heating they will grow in room temp. Pets may have salmonellosis, may become carriers. Cholera correct answer: comes mainly from contaminated water supplies and is endemic in mainland Asia and pacific rim. (natural disaster). The organism causing cholera is vibrio cholerae. Aerobic, rod shaped, motile, transmitted through contaminated drinking water, or through contaminated food that has been washed with contaminated water. Control=boiling the water, or treat the water. E Coli correct answer: opportunistic pathogen. Given opportunity will cause illness. Enteropathogenic v. enterotoxgenic-> (causes problems) strains. Cholera-like gastroenteritis. Produce "shigotoxin" and e coli with shigella genes (bread of 2 microbes). Incubation period 24 hours post ingestion. recover after 24 hours. rarely fatal. Enterotoxigenic strains, toxin is heat-labile ( toxins are produced by microbes, toxins are made of proteins) If you give them opportunity they will become pathogenic. E Coli Cont. correct answer: rod shaped, motile, non spore forming, facultative anaerobe, mesophile with optimum temp at 37C range of -2 +50 C. strain 0157:H7 causes severe hemorrhagic colitis-fatal. Illness associated with eating hamburgers. Associated with contaminated water, improperly/unpasteurized juice, milk, contaminated food. all comes from feces in animals. Hemolytic uremic syndrome-fever bruising, fatigue, short breath, body swelling, jaundice-devlops 7-10 days after initial diarrhea. Kidney failure in children. Children under 10 most likely to get it. Can lead to excessive bleeding, seizures or death.