The ability of a single person to remain free of clinical illness following exposure to an infectious agent is known as: - Answer-Immunity
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.
Which of the following is characteristic of a single-exposure, common-vehicle outbreak? - Answer-The epidemic curve has a normal distribution when plotted against the logarithm of time
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.
What is the diarrhea attack rate in persons who ate both ice cream and pizza? - Answer-39/52
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.
What is the overall attack rate in persons who did not eat ice cream? - Answer-33%
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).
Which of the food items (or combination of items) is most likely to be the infective item(s)? - Answer-Ice cream only
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