Attack rate
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|
|
|
Proportional Cause Specific Incidence/ Prevalence Ratio (P-CSIR or P-CSPR)
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=
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Cases of specific disease
————————————————
Cases of all disease
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|
|
|
Attack Rate
|
=
|
No. of individuals affected
————————————————————————————————
Population at risk at that time
|
x
|
100
|
|
Primary Attack Rate
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=
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No. of animals that develop disease in a particular period of time following exposure
———————————————————————————————————————————————
No. of animals exposed (population) in a particular period of time
|
x
|
100
|
|
Secondary Attack Rate
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=
|
Total no. of animals exposed to first case that develops disease within the range of incubation period
———————————————————————————————————————
Total no. of animals exposed to primary case
|
x
|
100
|
|
Last modified: Tuesday, 31 May 2011, 1:17 PM
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