. Preventive medicine and hygiene. d in the soil, upon the bedding, or on the clothing. This led tothe notion that fomites or inanimate objects played an important rolein the transference of disease. The early studies in bacteriology gavecountenance to this view until our knowledge of the part played by in-sects and the importance of contacts has placed fomites in a subordi-nate and oftentimes negligible position. The prevention of the class of infections belonging to the insect-borne diseases depends upon a knowledge and thorough comprehensionof three factors: (1) the disease, (2) the parasit
. Preventive medicine and hygiene. d in the soil, upon the bedding, or on the clothing. This led tothe notion that fomites or inanimate objects played an important rolein the transference of disease. The early studies in bacteriology gavecountenance to this view until our knowledge of the part played by in-sects and the importance of contacts has placed fomites in a subordi-nate and oftentimes negligible position. The prevention of the class of infections belonging to the insect-borne diseases depends upon a knowledge and thorough comprehensionof three factors: (1) the disease, (2) the parasite, and (3) the suppression or control of the insect depends upon a thorough knowl-edge of its biology. Entomology, therefore, has become a vitally im-portant subject so far as preventive medicine is concerned. Withoutan acquaintance with the life history and habits of the insect host therewill be economic loss, wasted energy, and disappointing results. Themalaria mosquito is active at night and breeds in the swamps; the. Fig. 19.—A South African Blood-Sucking Fly(Pangonia), Illustrating Long Proboscis toPierce Heavy Fur of Certain Animals. (Brues.) 204 INSECT-BOEXE DISEASES yello^r fever mosquito is active by day and breeds about houses. Othermosquitoes have their own particular breeding and hiding places. Thesuppression of lice depends largely upon bodily cleanliness, the suppres-sion of the bedbug upon house cleanliness, the dangerous fleas comelargely from association with other animals, the flies from manure anddecomposing organic filth, the ticks from other animals and from theinfested ground and woods. Eor the control of the insect-borne diseases it is not always neces-sary to exterminate the particular insect host. In fact, the extermina-tion of a particular species, much more a genus, is practically a biologicimpossibility. A material reduction in the numbers of the insects ina particular area will often result in an elimination of the disease. The geograph
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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
