Professional research and investigational work in the field of Epidemiology. An employee in this class conducts research and investigations into the occurrence and spread of communicable diseases throughout the nation. Work involves collating, analyzing, and interpreting data relevant to disease surveillance and control. Work also includes the preparation of reports, giving professional advice on appropriate measures to be adopted for effective prevention and control of communicable diseases, and the training of supporting technical staff. Work is performed with a great deal of initiative and independent judgment and is reviewed by a Medical Superior through discussions and analyses of reports for achievement of desired results.