EPIB 301 Lecture 10: Outbreak Investigations

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Epidemiology and Biostatistics
EPIB 301

EPIB 301: Infectious Disease Epidemiology Outbreak Investigations 5 steps in outbreak investigation: 1. Define problemverify outbreak occurred a. Confirm diagnosis: lab results can take 30 days i. of reported foodborne illness is higher than normal (endemic level) b. Establish criteria for case identification c. Search for missing cases 2. Appraise existing data a. Count cases b. Orient data according to personplacetime c. Determine who is at risk of becoming a case d. Analyze data 3. Formulate hypothesis a. Infection sourcevehicle b. Suspect foods c. Transmission mode d. Pathogen type e. Time factors, place factors, etc. 4. Test hypothesis a. Statistical tests, etc. 5. Draw conclusions and formulate action plan a. Develop reportsinform those who need to know b. Execute controlprevention measures c. Administration and planning activities Attack Rate Similar to incidence Rate (time) Used when nature of disease is such hat population is observed for short period of time often as result of specific exposure o Foodborne illness Number of people who ate X and developed Y Number of people who ate X total
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