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December 22, 2014

December 22, 2014

Posted by **DANIELLE** on Sunday, May 4, 2008 at 3:34pm.

Complete the problem below.

Disease X is one that often results in severe illness, but never is fatal. On March 21, 1990, 30 students developed disease X among all students in an introductory epidemiology course at a university. (Assume all epidemiology students were exposed to the index case, the instructor.) Through antibody titers we were able to determine the following:

Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, i.e., what are the infectivity, pathogenicity, and virulence of disease X?

a.# of exposed students not infected = 40

Not Infected

Number of ill students + # of students not infected = Total Attack rate

30 40 70 43%

b. # of exposed students with sub clinical infection = 10

Sub clinical infection

# of exposed students + # of students not exposed = Total Attack rate

30 10 40 75%

c. # of exposed students with mild symptoms = 10

Mild symptoms

# of exposed students + # of students not expose = Total Attack rate

10 40 50 20%

d. # of exposed students with moderate symptoms = 10

Moderate symptoms

# with moderate symptoms + # without moderate symptoms= Total Attack rate

10 40 50 20%

e. # of exposed students with severe symptoms = 10

Severe symptoms

# exposed with symptoms + # without severe symptoms = Total Attack rate

10 40 50 20%

Thanks

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