Plague

Plague is a zoonotic infection caused by the bacterium Yersinia pestis. Small mammals and their fleas usually maintain and transmit it. Clinicians recognise three main forms: bubonic, pneumonic and septicaemic Plague. Pneumonic Plague can spread between people through respiratory particles, while bubonic infection is usually acquired from infected fleas.

A suspected case requires laboratory confirmation because severe pneumonia can have other causes. Negative pathogen tests, contact monitoring and checks for ongoing transmission help investigators separate a plague outbreak from an unexplained illness. Media reports or a link to an anti-Plague laboratory do not establish the diagnosis on their own. That distinction matters because pneumonic Plague would require rapid public-health action, while an unconfirmed report must remain labelled as such.