Silicosis is due to excess inhalation of silica dust by workers involved in grinding or stone-breaking industries. Long exposure can give rise to inflammation leading to fibrosis and thus serious lung damage. Anthrax is a serious infectious disease caused by $Bacillus\ anthracis$; it commonly affects domestic and wild animals. Emphysema is a chronic disorder in which alveolar walls are damaged, due to which the respiratory surface is decreased. Botulism is a form of food poisoning caused by $Clostridium\ botulinum$.