A collection of (InfectionFn RespiratorySystem) caused by Plague_Bacterium. It can occur naturally as either a primary infection or as a secondary infection to BubonicPlague. It could also occur as the result of a BiologicalAttack in which there is an intentional release of an aerosol of Plague_Bacterium. PneumonicPlague would initially present with fever, cough, difficulty breathing, and sometimes watery or bloody sputum. It progresses similar to severe pneumonia. If not treated with antiobiotics it is usually fatal. Unlike, BubonicPlague, cases of PneumonicPlague do not usually have swollen lymph nodes. (en)