An impoant measure of the communicability of a disease is -
Case fatality rate
Disease specific moality rate
Infection rate
Secondary attack rate
.secondary attack rate is defined as the number of exposed persons developing the disease within the range of the incubation period following exposure to a primary case.its application is limited only to infectious diseases,in which the primary case is infective,.duration of exposure is also an impoant factor in determining the extent of spread. ref:park&;s textbook,22nd edition,pg no 96
Epidemiology