Differentiate between a Mosquito and a Sand fly. Give an example of food fortification. State the formula for Disease specific death rate and Case fatality rate with an example. 14. What is Nutritional rehabilitation?. List the methods of disinfection for sputum from a patient with tuberculosis. Distinguish symposium and panel discussion as modes of health education. List the measures of validity of a screening test. List the measures of dispersion. List the functions of United Nations International Children Emergency Fund (UNICEF). Distinguish between a hazard and a risk in occupational health.