Health officials adopt a sensitive case definition for such uncommon but potentially serious communicable diseases, for which it is crucial to identify every potential case.
A broad or "loose" definition of a sensitive case is one that attempts to encompass most or all real cases. Criteria for person, place, time, and clinical aspects are included in a case definition. These need to be unique to the epidemic being looked into. Depending on the disease of interest, useful age groups can be determined for investigation. Both reciprocal exclusion and all-inclusiveness are required for categories. When two categories are mutually exclusive, the beginning of one category cannot precede the beginning of the next category.
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