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A thoroughgoing study on resistance was achieved for the first time in insecticides, later on finding that, this can be extended also in anthelmintic substances. The resistance to anthelmintics evolved gradually from a simple medical curiosity, to an important economic problem. Many factors contribute to the appearance of resistance to anthelmintic substances. After epidemiological studies on various helmintic populations, it was concluded that there are four essential and distinguish factorsfatcat:mhobecpe7jevloornjd4nbb7jq