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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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