<prompt> Malignant pustule is caused byPseudomonasStreptococcusStaphylococcusBacillus anthrax  <response>: Ans. d Bacillus anthrax Ref. Ananthanarayan, Microbiology, 8th p. 245.Bacillus anthrax causes anthrax and disease fee seen in Joans:1. Cutaneous,2. Pulmonary,3. Intestinal- Cutaneous is the most common form malignant pustule, hide porters disease.- Pulmonary is wool sorters disease.0BACILLUS ANTHRAX Bacillus anthrax and Clostridia are Gram-positive spore-forming rods. B. anthracis is the bacterium which causes anthrax in cows, sheep, and sometimes humans. Anthrax is transmitted to humans via direct contact with animal products or inhalation of endospores. Under the microscope, B. anthracis cells appear to have square ends and seem to be attached by a joint to other cells. The spores are best observed when the bacterium is cultured on artificial media. Anthrax is a zoonosis. The infected animals shed the bacilli in their discharges, which sporulate in soil and remain as source of infection. LAB features: Cultural characteristics of B. anthrax:- Nonhemolytic sheep blood agar.1. MFadyeans reaction - Non-motile2. Frosted glass appearance- Gel hydrolysis -3. Medusa head appearance - Catalase 4. Inverted tree appearance 5. PLET media is used as selective media. 