<prompt> Which of the following is false regarding point source single exposure epidemic?Often explosiveIs caused by infectious agents onlyCases develop within incubation period onlyRapid rise and fall of epidemic curve occurs  <response>: Point source single epidemic is commonly caused by infectious agent but not always. The example of non infectious agents being involved include Bhopal gas tragedy, Chernobyl tragedy etc. Ref: Park, 21st Edition, Pages 60, 61. 