What is the pneumonic plague?

See below part 1: Pneumonic plague can be primary or secondary. Primary pneumonic plague can be acquired by inhalation of respiratory secretions or aerosolized droplets from infected animals or humans, or by laboratory exposure. Secondary pneumonic plague is more common and arises via hematogenous spread of bacteria from a bubo or other source.

It is an infection: Caused by Yersinia pestis. Primary pneumonic plague can be acquired by inhalation of respiratory secretions or aerosolized droplets from infected animals or humans or by complicating otter forms of plague. It has short incubation period (hours to days) followed by sudden onset of difficulty breathing, fever, chest pain, cough with bloody sputum.

Plague in the lungs: This is the kind of plague infection that can spread directly from one person to another . It can be a complication of bubonic plague with spread to the lungs from the bloodstream or develop directly from an aerosol.

Bubonic plague: Bubonic plague is caused by bacteria Yersinia pestis also known as Pasteurela pestis, it results from bite of a infected flea which are often found on rodents such as rats and mouse, and seek out other prey when rodent dies.It is transmitted to human host by bite, it rapidly spreads to the lymph nodes and multiply.