<prompt> Secondary attack rate is defined as-Number of total cases developing disease within maximum incubation periodNumber of case developing disease within incubation period following exposure to primary careNumber of cases developing diseare after exposure to primary case in any period of timeNumber of cases developing after exposure to secondary case  <response>: Ans. is b i.e., Number of cases developing disease within incubation period following exposure to primary case SAR is defined as the number of exposed persons developing the disease within the range of incubation period, following exposure to primary case.SARNo of exposed persons developing disease within the range of the incubation period---Total number of exposedsusceptible contactx 100 