<prompt> Killing power of disease isSecondary attack rateCase fatality rateIMRMMR  <response>: Ans. b Case fatality rate. Ref. Park, PSM, 17th ed., 52, 88- CFR is measurement of killing power of a disease.Secondary attack rate Number of exposed persons developing the disease within the range of IP---Total number of exposedsusceptible contactsx 100- The primary case is excluded from both the numerator and denominator. 