<prompt> Virulence of a disease is indicated by:Proportional mortality rateSpecific mortality rateCase fatality rateAmount of GDP spent on control of disease  <response>: Ans. c Case fatality rateCASE FATALITY RATE CFR: CFR represents killing power of a disease- It is closely related to virulence of organismCFRTotalno.ofcasesduetoadiseaseTotalno.ofdeathsduetoadisease x100 CFR is a Proportion: Always expressed in percentage CFR is the complement of Survival Rate, thus CFR 1 - Survival Rate Limitations of CFR:- Time interval is not specified- Usefulness is limited for chronic diseases - CFR for the same disease may vary in different epidemics 