Measure of lnfectivity of a disease:
Ref: Park 'Textbook of Preventive and Social Medicine', 22nd edition, Pg: 58, 55, 96Explanation:Incidence rateNumber of new cases occurring in a defined population during a specified period in timePrevalence rateIt includes old and new cases, it depends on Incidence and duration of disease Prevalence = incidence X durationSecondary attack rateIndicates communicability or infec- tivrtyNo. of contacts d eve lo Dina disease in one maximum IP X 100 Total no. susceptible contactsCase fatality rateSeverity of the disease, killing power of the diseaseIndicators of severity of disease1. Case fatality rate2. Disability rate
Incidence rate
Prevalance rate
Secondary attack rate
Case Fatality rate
Infectious Disease Epidemiology