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In adults, a morning temperature above 98.8°F (37.2°C) or a night temperature above 99.9°F (37.7°C) is generally defined as a fever. Rectal temperature is generally 1°F (0.6°C) higher and reflects core temperature. Axillary temperature is approximately 1°F (0.6°C) lower than oral temperature. Infection (viral [including HIV and AIDS], bacterial, mycobacterial, fungal, parasitic), neoplasm (lymphoma, leukemia, renal and hepatic carcinoma), connective tissue disease (SLE, vasculitis, rheumatoid arthritis, adult Still disease, temporal arteritis), heat stroke, malignant hyperthermia, thyroid storm, adrenal insufficiency, pulmonary embolus, MI, atrial myxoma, inflammatory bowel disease, factitious factors, drugs (most commonly amphotericin, bleomycin, barbiturates, cephalosporins, methyldopa, penicillins, phenytoin, procainamide, sulfonamides, quinidine, cocaine, LSD, phencyclidine, and amphetamines)

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