In an epidemic first to be done is -
verification of diagnosis is the first step in the investigation of an epidemic.it is necessary to examine all cases before arriving at a diagnosis.a clinical examination of a sample of cases may suffice.laboratary investigations can also be employed in such way that it is not delaying any of the epidemiological investigations concerned. ref:park&;s textbook,ed22,pg no 123
Identity the cases
Confirm the diagnosis
Identify The prone people
Identify the causative factors
Epidemiology