Which of the following is true regarding anthrax ?
Ans. is 'a' i.e., M' Fadyean reaction shows capsule; 'b' i.e., Humans are usually resistant to infection; 'c' i.e., Less than 100 spores can cause pulmonary infection . M' Fadyean's reaction represents the capsular material and is characteristic of the anthrax bacillus. . "Man is relatively resistant to infection with B. anthracis". - Green wood 16th/e 226 . In animal studies, it has been shown that aerosolized anthrax -- 10,000 spores required to produce lethal disease. However, it has been suggested that as few as one to three spores may be adequate to cause disease in some setting. - Harrison 17thie 1344 . Spores are of same width as the bacillary body so that they do not cause bulging of the vegetative cell (in contrast the clostridia have bulging spores). . For laboratory diagnosis, specimens to be examined are fluid or pus from a local lesion, blood or sputum. Stained smears often show chains of large gram positive rods.
M' Fadyean reaction shows capsule
Humans are usually resistant to infection
Less than 100 spores can cause pulmonary infection
All