<prompt> What is the actual intention of doing sentinel surveillance?To know the total number of casesFor health planningTo know the natural history of the diseaseTo prevent the disease  <response>: Sentinel surveillance A method for identifying the missing cases and thereby supplementing the notified case is required Sentinel surveillance is extrapolated to the entire population to estimate the disease prevalence in the total populationRefer: K. Parks Textbook of Preventive and Social Medicine, 24th edition, pg no: 45 