You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is First step in investigation of an epidemic is:- and explain in detail?
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