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close this bookTraining Manual in Combatting Childhood Communicable Diseases Part I (Peace Corps, 1985, 579 pages)
close this folderModule 3: Community analysis and involvement
close this folderSession 13: Survey and disease surveillance
View the document(introductory text...)
View the documentHandout 13A: Disease surveillance procedures
View the documentHandout 13B: Charting exercises
View the documentTrainer Attachment 13A: Defining survey and surveillance
View the documentTrainer Attachment 13B: Definition of rates
View the documentTrainer Attachment 13C: Survey methodology
View the documentTrainer Attachment 13D: Sample out-patient register
View the documentTrainer Attachment 13E: Examples of surveillance forms
View the documentTrainer Attachment 13F: Visualization of numerical data

Trainer Attachment 13B: Definition of rates

Incidence Rate

- In surveillance feedback is a report that interprets the data collected and is distributed to those who have collected it. The number of new cases of a specified disease diagnosed or reported during a defined period of time as the numerator, and the number of persons in a stated population in which they occur as the denominator. A rate is the average risk of disease in that time interval.

Mortality rate

- A rate calculated in the same way as an incidence rate using as the numerator the number of deaths occurring in the population during the stated period of time.

Prevalence Rate

- The numerator is the number of persons sick or portraying a certain condition in a stated population, at a particular time, regardless of when that illness or condition began, the denominator is the number of persons in that population.