Epidemiology
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ph384.docx|
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· Question 1
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Use your own words to explain what is meant by the epidemiological triangle to a person who does not know epidemiology. Explain the three elements of the triangle as well. |
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· Question 2
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Use your own words to explain carrier and index case to a person who does not know epidemiology. |
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· Question 3
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Use your own words to explain the terms: reliability and validity to a person who does not know epidemiology. |
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· Question 4
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Use your own words to explain what is subclinical and explain why are subclinical (also called “inapparent”) diseases significant for epidemiology and public health to a person who does not know epidemiology? |
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· Question 5
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· Question 6
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Use your own words to explain herd immunity, passive immunity, and active immunity to a person who does not know epidemiology. |
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Question 7
Assume a population of 3000 people, of whom 675 have a disease. Of these 675 people, the test correctly identifies 450. Out Of the disease-free people, the test correctly identifies 1500. (10 points)
a.Construct the contingency table
b.Calculate the sensitivity of the test
c. Calculate the specificity of the test
d. Calculate the positive predictive value
e. Calculate the negative predictive value
f. Provide a summary about the screening test based on the above calculation (2 points)
