We do call it disease when pathogens such as viruses, bacteria, and fungi impair the function of the body. [Please select]
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The Department of Agriculture, therefore, does not prepare, use, or recommend the use of rat viruses. [Please select]
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A number of these so-called rat viruses are on the American market. [Please select]
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The Biological Survey, the Bureau of Animal Industry, and the United States Public Health Service have made careful investigations and practical tests of these viruses, mostly with negative results. [Please select]
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