1913 Swiss disease control referendum|
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|    | Choice | Votes | % |   |  Yes | 169,012 | 60.32% |   |  No | 111,163 | 39.68% |   | Valid votes | 280,175 | 92.10% |   | Invalid or blank votes | 24,031 | 7.90% |   | Total votes | 304,206 | 100.00% |   | Registered voters/turnout | 844,175 | 36.04% |  | 
  A referendum on disease control was held in Switzerland on 4 May 1913.[1] Voters were asked whether they approved of amending two articles of the constitution, 31 II, lit d and 69, which covered the control of human and animal diseases.[1] It was approved by a majority of voters and cantons. 
 Background
 The referendum was a mandatory referendum,[1] which required a double majority; a majority of the popular vote and majority of the cantons.[2] The decision of each canton was based on the vote in that canton.[2] Full cantons counted as one vote, whilst half cantons counted as half.[2] 
 Results
   | Choice | Popular vote | Cantons | 
  | Votes | % | Full | Half | Total | 
  | For | 169,012 | 60.3 | 15 | 5 | 17.5 | 
  | Against | 111,163 | 39.7 | 4 | 1 | 4.5 | 
  | Blank votes | 16,409 | – | – | – | – | 
  | Invalid votes | 7,622 | – | – | – | – | 
  | Total | 304,206 | 100 | 19 | 6 | 22 | 
  | Registered voters/turnout | 844,175 | 36.0 | – | – | – | 
  | Source: Nohlen & Stöver | 
 References
   - ^ a b c Nohlen, D & Stöver, P (2010) Elections in Europe: A data handbook, p1907 ISBN 9783832956097 
- ^ a b c Nohlen & Stöver, p1891