1. A flu outbreak occurred in a military barracks that housed 20 soldiers. Case

Question

1. A flu outbreak occurred in a military barracks that housed 20 soldiers. Case A was diagnosed on October 1 and Case B was diagnosed on October 2. After approximately 10 days, 12 additional cases occurred during approximately a 1 week time span. Military epidemiologists believe that this second group of 12 cases represented another generation of cases. None of the 20 soldiers was known to be immune to the disease. Calculate the secondary attack rate using the forgoing data (6 points total).

a. Calculate the primary attack rate. (2 points).

PAR= ill/ill+well =14/20x100= 70%

b. Calculate the secondary attack rate assuming that once a person has the illness, each is immune from re-infection (2 points).

SAR=14-2/20-2x100 =66.7%

c. Calculate the secondary attack rate assuming that initial illness does not impute re-infection (2 points).

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Explanation / Answer

Answer:

Based on the given information:

a. Calculate the primary attack rate.

Primary attack Rate (PAR)= Number of new cases / Total population

= 100*(14 / 20) = 70%

b. Calculate the secondary attack rate assuming that once a person has the illness, each is immunefrom re-infection  

Secondary Attack Rate (SAR) = Number of cases among contacts of primary cases / Total number of contacts

= 100*[(14-2)/(20-2)] =66.7%

c. Calculate the secondary attack rate assuming that initial illness does not impute re-infection:

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