<prompt> In a patient suspected to be diagnosed with Rabies, a sample of corneal smear was taken. Which of the following investigations can be done from the specimen?RT PCRImmunofluorescence testNegri body visualizationVirus isolation  <response>: Ans. b Immunofluorescence test stylefont-size: 1.04761904761905em; font-family: Times New Roman, Times, serifRef: Lab diagnosis of rabiesRT-PCR: detecting the viral nucleic acid especially on biological fluids saliva, cerebrospinal fluid, tears and skin biopsy ante mortem and brain samples post mortemSerum and spinal fluid are tested for antibodies to rabies virusSkin biopsy specimens are examined for rabies antigen in the cutaneous nerves at the base of hair folliclesImmunofluorescent antibody staining of the epithelial cells on the corneal impression test FAT 