File:REPORTED CASES OF LOUSE-BORNE TYPHUS IN THE AMERICAS, 1949-1958.png

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English: Reported cases of louse-borne typhus in American countries, for the period 1949-1958.[1] The notable decrease in cases correlates with the development of DDT implementation in the 1940s and 1950s.[2]
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  1. ↑ REPORTED CASES OF NOTIFIABLE DISEASES IN THE AMERICAS 1949 - 1958. paho.org. Retrieved on 24 February 2017.
  2. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named britannica

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current05:24, 24 February 2017Thumbnail for version as of 05:24, 24 February 2017745 × 616 (39 KB)Wikisanchez (talk | contribs)User created page with UploadWizard

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