You are here: Home » Community Medicine » Case of Point Source Epidemic

Case of Point Source Epidemic

Out of the 75 persons who attended the picnic, 46 subsequently developed gastroenteritis.


  1. Calculate the attack rate?
  2. Draw an appropriate epidemic curve.
  3. Is this a primary or a secondary attack rate?
  4. Is this an incidence of prevalence rate?


1)      Calculation

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 :

Point source epidemic curve

3)       It is primary attack rate

4)      It is an incidence rate

Leave a Reply

Your email address will not be published. Required fields are marked *


Scroll To Top