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A disease characterized by fever and leukocytosis that presents in one or more of the following principal clinical forms:
Probable: a clinically compatible illness with supportive laboratory results (demonstration of a single serologic test result suggestive of recent infection with no history of immunization, or demonstration of a Fraction I antigen in blood, bubo aspirate, or tissue by antigen detection -- enzyme-linked immunosorbent assay (ELISA) or fluorescent assay (FA))
Confirmed: a case that is laboratory confirmed
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