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Chronic false positive USR results may occur in cases of autoimmune disease (lupus, SLE, etc.), persons who abuse drugs, or in cases of other infections (e.g. leprosy, mononucleosis, malaria, viral pneumoniae, Lyme disease, etc). Transitory false positives occur in 1-2% of pregnancies and up to 6 months after occurrence of various febrile diseases. ................
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