Entomological evaluations of results of residual DDT spraying during 1946
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Entomological evaluations of results of residual DDT spraying during 1946

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      During the 1946 season the Communicable Disease Center of the U. S. Public Health Service, in cooperation with State Health Departments in the Southern States continued and expanded the Extended Program for malaria control which was begun during 1945. This program consists principally of the spraying of DDT in houses to control malaria in the more important endemic areas of the South, and to meet the threat of increased malaria transmission occasioned by the return of service personnel who contracted the disease overseas. During 1945 the houses and privies on some 40,000 premises were given one or more treatments with DDT emulsion applied at the rate of 100 mg. of DDT per square foot. Over 750,000 houses in 266 counties of 13 states were treated during the 1946 season with a similar number of residual applications of DDT. In 1946, however, the DDT application rate was doubled, that is, 200 mg. were applied per square foot in an effort to secure a longer lasting residual effect and thereby decrease the frequency of application.
    • Source:
      CDC Bull. 1947 July August September 1947;6(3):7-10
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