Description
Epidemiology Morbidity and Mortality Frequency calculations
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CASE STUDY 1
1. Attack rate for measles at Marshall Middle School during March and April
= Cumulative incidence of infection in a group observed during an epidemic x 100%
Number of people exposed
= 87 x 100% = 23.7%
367
2. Attack rate in the population of females
= Cumulative incidence of infection among female observed during an epidemic x 100%
Number of females exposed
= (87- 38) x 100% = 24.7%
198
3. Secondary attack rate among siblings
= Number of cases among contacts of primary cases x 100%
Total number of contacts
= 97 x 100% = 68.8%
141
4. Case-fatality rate for measles outbreak
= Number of deaths from a specific disease ...
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