<prompt> Which of the following is true regarding anthraxM Fadyean reaction shows capsuleHuman are usually resistant to infectionLess than 100 spores can cause pulmonary infectionGram stain shows organism with bulging spores  <response>: M Fadyeans reaction: When blood films containing anthrax bacilli are stained with polychrome methylene blue for a few seconds and examined under a Microscope, amorphous purplish material is noticed around the bacilli. This represents the capsular material and is characteristic of the anthrax bacilli. Reference: Textbook of Microbiology; Anathanarayan and panickers; 10th edition; Page no: 251 