Which of the following is true regarding anthrax?: (A) McFadyean reaction shows capsule, (B) Humans are usually resistant to infection, (C) Less than 100 spores can cause pulmonary infection, (D) Gram stain shows organism with bulging spores
Answer is A. Ans. is 'a' i.e., McFadyean reaction shows capsuleHumans are usually resistant to infection and Sputum microscopy helps in diagnosis in case of pulmonary anthrax.Stained smears from the local lesion or of blood from clinical samples of human or dead animals often show chains of large gram-positive rods (spores are not in clinical samples). Anthrax can be identified in dried smears by direct immunofluorescence staining techniques.