Serial interval measures
.serial inetrval is the time gap between the onset of primary cases and the secondary cases.by collecting information on the whole series if such onsets,we get a distribution of secondary cases from which we can guess the incubation period of disease. ref:park&;s textbook ,22 nd edition,pg no 96
Incubation period of disease
Sensitivity
Specificity
Positive predictive value
Epidemiology