100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
Previously searched by you
NR503 EPI MIDTERM EXAM QUESTION BANK, NR503 EPI FINAL EXAM QUESTION BANK (LATEST-2022): CHAMBERLAIN COLLEGE OF NURSING |100% CORRECT Q & A|$20.49
Add to cart
Explanation
Immunity is the capacity of a single individual to avoid disease susceptibility when exposed to
an infectious agent. Herd immunity is a population characteristic. For certain diseases, individual
immunity can be acquired by vaccination, but this is not true for all infectious diseases.
Question 4
Which of the following is characteristic of a single-exposure, common-vehicle outbreak?
Long latency period before many illnesses develop
There is an exponential increase in secondary cases following initial exposures
Cases include only those who have been exposed to sick persons
The epidemic curve has a normal distribution when plotted against the logarithm of time
Wide range in incubation times for sick individuals
Explanation
Single-exposure, common-vehicle outbreaks involve a sudden, rapid increase in cases of disease
that are limited to persons who share a common exposure. Additionally, few secondary cases
develop among persons exposed to primary cases. A histogram of the outbreak can plot the
number of cases by time of disease onset. In single-exposure, common-vehicle outbreaks, a log
transformation of the time of disease onset will often take on the characteristic shape of a normal
distribution (i.e., a bell curve) with the median incubation time found at the peak of the curve.
, Question 5
What is the diarrhea attack rate in persons who ate both ice cream and pizza?
39/52
21/70
39/67
51/67
none of the above
Explanation
The attack rate in this example is defined as the number of persons who develop diarrhea divided
by the total number of people at risk. In this example, the at-risk group is those who have eaten
both ice cream and pizza. Of these 52 persons, 39 developed diarrhea.
Question 6
What is the overall attack rate in persons who did not eat ice cream?
30%
33%
35%
44%
58%
Explanation
The attack rate is the number of persons with diarrhea (14 + 9) divided by the total number of
persons who did not eat ice cream (40 + 30).
, Question 7
Which of the food items (or combination of items) is most likely to be the infective item(s)?
Pizza only
Ice cream only
Neither pizza nor ice cream
Both pizza and ice cream
Cannot be assumed from the data shown
Explanation
Among persons eating ice cream, over 70% developed diarrhea regardless of their pizza
consumption (39/52 and 11/15). Among both groups of persons who did not eat ice cream, each
attack rate was equal to or less than 35% (14/40 and 9/30).
Question 8
Which of the following reasons can explain why a person who did not consume the infective
food item got sick?
They were directly exposed to persons who did eat the infective food item
Diarrhea is a general symptom consistent with a number of illnesses
There may have been an inaccurate recall of which foods were eaten
All of the above
None of the above
Explanation
Without knowledge as to the specific agent in this instance, it is also likely that it can be spread
by direct contact with infected persons. Since diarrhea is a general disease symptom, it is
possible that several infectious agents may be present at this meal or others eaten during the
same time period. Further, information regarding food consumption may have been collected
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller waldenquiz. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $20.49. You're not tied to anything after your purchase.
