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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:
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