UPDATE: At 3:00 p.m., the health director calls to report that an additional 42 residents have reported being ill to the on-site clinic. Eight of those were sent to the local hospital due to advanced symptoms. In addition, you have learned that four people, all non-residents who were visiting the facility, have reported to the urgent care clinic with similar symptoms. You call the local hospital to get information regarding the eight people who went there and learn that three were admitted; the other five were treated with fluids and released. The hospital tells you it has collected samples from all eight and sent them to the lab for analysis. How many total sick people are there?
Question 3 options:
a) 90
b) 94
c) 102
d) 107
What is the updated attack rate for the residents of the retirement community?
a) 0.18
b) 0.188
c) 18
d) 188
UPDATE: The hospital lab calls to report the tests have come back positive for E.coli. You contact the health director at the retirement community to inquire about possible exposure to food-borne illness. You learn that there is a cafeteria in the community that all residents have access to. On the day in question, 327 residents and two guests ate in the cafeteria. In addition, you learn that there was a special "speed dating" event for single residents of the retirement community. The event was held outside by the pool and included a buffet. With the help of the director, you determine that 225 people attended the event. Two of the visitors who are ill also attended the event. After conducting interviews, you discover that 75 of the total cases attended the speed dating event. No guests or residents ate at both the cafeteria and the speed dating event. You must determine if you should focus your investigation on the cafeteria or the speed dating event. Calculate the risk ratio(s) among residents to determine which exposure is most likely to be the source of the outbreak.
a) Speed dating event
b) Cafeteria