Investigation of choice of diphtheria carrier is
One or two swabs from the lesions are collected under vision, using a tongue depressor. Smears stained with methylene blue or one of the special stains (Neisser's or Albes) will show the bacilli with metachromatic granules and in the typical arrangement. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 242
Throat Swab Culture
Gram's stain
Albe's stain
Zeil Nelson's stain
Bacteriology