A high-risk patient was informed of a positive HIV antibody/antigen test. However, follow-up samples taken 2-3 months later for HIV RNA and anti-HIV antibodies were negative. Human DNA testing confirmed that all samples were from this patient, excluding a sample mix-up. Laboratory investigations revealed a likely splash-over contamination event.
Keywords: Cross-contamination; Forensic; Microsatellite; Mix-up; Sensitivity; Short tandem repeats.
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