Who gave Web of causation theory?: (A) John snow, (B) Antonie van Leeuwenhoek, (C) Macmahon and Pugh, (D) Louis pasteur
Answer is C. The Web of causation theory was given by Macmahon and Pugh. It is based upon the epidemiological triad of: Agent Host Environment Ref : Park 20/e, Page 32.