Pneumonic fever, also known as pneumonic plague or lung plague, is a severe bacterial infection that affects the lungs and can be highly contagious. Synonyms for this condition include pulmonary plague, bronchopneumonia, pneumonic pestilence, and pulmonary anthrax. The term "pneumonia" is often used interchangeably with pneumonic fever, but it is important to note that pneumonia can be caused by various pathogens, whereas pneumonic fever specifically refers to the bacterial infection Yersinia pestis. Other illnesses that may produce similar symptoms include viral pneumonia, tuberculosis, and bronchitis. Early detection and treatment are crucial for managing pneumonic fever and preventing its spread.