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Outbreak of Escherichia coli O157:H7 Infection Associated With Eating Fresh Cheese Curds
— Wisconsin, June 1998. Morbidity and Mortality Weekly Report. October 13, 2000. 49(40):911-913.Epidemiologic Notes and Reports Isolation of E. coli O157:H7 from Sporadic Cases of Hemorrhagic Colitis
— United States Morbidity and Mortality Weekly Report. August 1, 1997. 46(30):700-704.
1. What was the odds ratio of persons who ate watermelon and becoming ill? (2 points).
a. 8
b. 15
c. 800
d. 62
2. What is the term that means a pathogen is transferred from one food item to another food item? (3 points)
a. sabotage
b. cross-contamination
c. incubation period
d. mode of infection
e. bio-terrorism
3. Give two examples of the above. (2 points each)
4. Why are antibiotics discouraged to treat E. coli O157:H7 infections in children? (2 points)
5. One of the articles discusses confirmed cases, probable cases, and possible cases. Investigators determine these categories by defining: (2 points)
a. the incubation period
b. the source of exposure
c. the mode of transmission
d. the case-definition
6. Write an example of this for confirmed case-patients that the investigators in this outbreak may have used. (5 points)
7. What is the case-fatality rate of this outbreak, using the combined number of confirmed and probable case-patients. (4 points)
a. 0.14%
b. 0.18%
c. 1.61%
d. 0.16 %
8. Calculate the odds ratio given the following data. (4 points)
|
a. 15.3
b. 14.4
c. 9.8
d. 18.7
Match the disease with mode of transmission.
| 1. ___ Hepatitis A | A. Tick-borne |
| 2. ___ Hepatitis B | B. Blood/sexual |
| 3. ___ HIV | C. Food-borne/fecal-oral |
| 4. ___ E. coli O157:H7 | D. Mosquito-borne |
| 5. ___ West Nile Virus | E. Unknown |
| 6. ___ Lyme Disease | |
| 7. ___ Kawasaki Disease | |
| 8. ___ Campylobacter | |
| 9. ___ Rocky Mountain Spotted Fever | |
| 10. ___ Malaria |
