system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In epidemic, 1st step is?
assistant
The correct answer is  The steps in epidemic investigation are :

Verification of diagnosis
Confirmation of the existence of epidemic
Defining the population at risk
Obtaining a map of the area
Counting the population
Rapid search for all cases & their characteristics
Medical survey
Epidemiological case sheet
Searching for more cases
Data analysis
Formulation of hypothesis
Evaluation of ecological factors
Further investigation of population at risk
Writing the report