Out of the 75 persons who attended the picnic, 46 subsequently developed gastroenteritis.
- Calculate the attack rate?
- Draw an appropriate epidemic curve.
- Is this a primary or a secondary attack rate?
- Is this an incidence of prevalence rate?
Attack rate = number of exposed people infected with the disease divided by the total number of exposed people
Thus attack rate = 46/75 x 100 = 61.33%
2) Epidemic curve :
3) It is primary attack rate
4) It is an incidence rate