Epidemiology - Public Health The table below shows the mumps experience of child
ID: 245476 • Letter: E
Question
Epidemiology - Public Health
The table below shows the mumps experience of children in 390 families exposed to mumps by a primary case within the family:
Population
Cases
Age in years
Total
No. susceptible before primary cases occurred
Primary
Secondary
2 ? 4
300
250
100
50
5 ? 9
450
420
204
87
10 ? 19
152
84
25
15
The secondary attack rate among children aged two to four years is:
A. 18%
B. 20%
C. 33%
D. 50%
E. 60%
The table below shows the mumps experience of children in 390 families exposed to mumps by a primary case within the family:
Population
Cases
Age in years
Total
No. susceptible before primary cases occurred
Primary
Secondary
2 ? 4
300
250
100
50
5 ? 9
450
420
204
87
10 ? 19
152
84
25
15
The secondary attack rate among children aged two to four years is:
A. 18%
B. 20%
C. 33%
D. 50%
E. 60%
Explanation / Answer
Secondary attack rate 2-4 years old =
(150-100)/(250-100) x 100 = 33%
Correct option: C. 33%
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