<prompt> Investigation of choice of diphtheria carrier isThroat Swab CultureGrams stainAlbes stainZeil Nelsons stain  <response>: 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 Neissers or Albes will show the bacilli with metachromatic granules and in the typical arrangement. Reference: Textbook of Microbiology; Anathanarayan and panickers; 10th edition; Page no: 242 