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refers to protozoans and worms |
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organism with the potential to cause a disease |
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pathogen growing in or on the host |
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ability of a pathogen to spread to other tissues in the body |
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degree of intensity of pathogenicity |
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ability of pathogen to secrete toxins |
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infection in which the pathogen grows massively in the body being found all throughout the blood and organs |
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scientific study of disease |
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organism that shelters and supports the growth of pathogens |
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establish permanent colonies inside or on the body without producing disease |
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- members of the normal flora that are not always present or are present for only a few days, weeks, or months before disappearing |
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close and often long interaction between different biological species |
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risk of the disease (number of new cases) |
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burden of the disease (number of existing cases) |
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only an occasional case (typhoid fever) |
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constantly present at an expected level (common cold) |
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above the normal expected frequency (flu) |
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