Access the following case study: Oswego - An Outbreak of Gastrointestinal Illness following a Church Supper

Access the following case study:
Oswego - An Outbreak of Gastrointestinal Illness following a Church Supper
at: http://www.cdc.gov/eis/casestudies/xoswego.401-303.student.pdf
answer the following questions included in the case study: 11 and 12.
PLEASE DO QUESTION ONE ON A SEPARATE PAGE FROM QUESTION 2.

On June 1, 2001, 13 people became ill after attending a retirement dinner for a colleague. The symptoms were acute gastritis, vomiting, and fever. Using the food histories in the following table for the 20 individuals attending the dinner, construct an attack rate table and determine the most likely source of the outbreak. Justify your response.

Person	Became Ill?	Ate Beef?	Ate Chicken?	Ate Salad?
1	yes	yes	yes	yes
2	yes	yes	yes	no
3	yes	no	yes	yes
4	No	yes	NO	NO
5	YES	YES	NO	YES
6	NO	YES	NO	NO
7	YES	YES	YES	YES
8	YES	YES	NO	YES
9	YES	NO	YES	NO
10	NO	NO	YES	NO
11	YES	YES	YES	NO
12	NO	NO	NO	YES
13	NO	NO	NO	NO
14	YES	YES	YES	YES
15	NO	N O	NO	YES
16	NO	NO	YES	NO
17	YES	YES	NO	YES
18	YES	YES	NO	YES
19	YES	YES	YES	NO
20	YES	YES	YES	NO

of 33%.

In a small community of 460 residents, 87 attended a social event that included a meal prepared by several individuals. Within 3 days, 39 of those who attended the event became ill with a condition diagnosed as salmonella enterocolitis. What is the attack rate among attendees? Interpret your result.
In a community of 800 households (population 4320), public health authorities found 120 persons with condition X in 80 households. A total of 480 persons lived in the 80 affected households. Assuming that each household had only one primary case, what is the secondary attack rate? Interpret your result.
A flu outbreak occurred in a small college dormitory that housed 20 students. Case A began on October 1 and case B was diagnosed on October 2. After approximately 10 days, 12 additional cases occurred during approximately a one-week time span. University epidemiologists believed that this second group of cases represented the same generation of cases, and was in the second incubation period after the occurrences of cases A and B; none of the 20 students was known to be immune. Calculate and interpret the secondary attack rate.