<prompt> The interval between the primary and the secondary case is called as:Serial intervalGeneration timeMedian Incubation periodLatent period  <response>: Ref: 21st edition Park. Pg 95Explanation:Incubation periodBetween invasion by an infectious agent and appearance of the first sign symptomsMedian Incubation periodThe time required for 50 percent of the cases to occur following exposureLatent periodEqual to IP in non-communicable diseaseSerial intervalBetween onset of primary case and secondary caseGeneration timeInterval between the receipt of infection by a host and maximal infectivityPeriod of communicabilityDuring which an infectious agent can be communicated 