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Step 4. Define and identify cases Step 4. part 1. 1. Case definition- establish with 4 components or standard criteria for determining who has the disease or condition a. clinical information- about the disease or condition b. Characteristics- of the affected people c. location or place- as specific as possible as restaurant, county, or several specific areas d. time sequence- specific time during which the outbreak or condition occured Step 4. part 2. identification of specific cases- kind & number- count specific cases a. Confirmed- have diagnosis with case definition plus lab verification b. Probable- many factors point to diagnosis but may lack lab verification c. possible- some factors point to diagnosis NOTE: initial reports may be only a small sampling of the total problem. Be sure to expand search to determine the true size and extent to the problem. Step 4. part 3. Line listing- chart of specific cases including info about each case. a. identifying information- ID or case #- left column + name or initials b. Clinical info- diagnosis, symptoms, lab results, hospital- death? c. descriptive: time- date and time of onset + date of report d. Descriptive: person- age, sex, occupation, other characteristics e. Descriptive: Place- street, city or county + specific site f.Risk factors & possible causes- specific to situation ( disease) and outbreak setting sample line listing- random information 1. 2. 3. 4. 5. 6.