First step in investigation of an epidemic is:-

Investigation of an epidemic-chronological steps: 1) Verification of diagnosis - 1st step2) Confirmation of existence of epidemic 3) Defining population at risk 4) Rapid search of all cases and their characteristics 5) Data analysis 6) Formation of hypothesis 7) Testing of hypothesis 8) Evaluation of ecological factor 9) Fuher investigation of population at risk 10) Writing the repo