In an epidemic, the 1st step is
High-Yield Explanation
The steps in an epidemic investigation are :Verification of diagnosisConfirmation of the existence of the epidemicDefining the population at riskObtaining a map of the areaCounting the populationRapid search for all cases & their characteristicsMedical surveyEpidemiological case sheetSearching for more casesData analysisFormulation of hypothesisEvaluation of ecological factorsFuher investigation of the population at riskWriting the repo