Serology for Diagnosis of Rabies • Rapid Fluorescent Focus Inhibition Test (RFFIT) ; - Results are positive after first week of illness - Positive results in 50% of the cases • PCR - 100% specificity in brain biopsy specimen - 67% sensitivity in hair follicles specimen - 25% sensitivity in corneal touch impressions - Uses saliva, urine, CSF, and hair follicles