Yersinia pestis infection classification
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Bubonic plague is transmitted by flea bite or direct contamination of an open skin lesion by plague-infected material. The infection spreads to the regional lymph nodes causing inflammation and swelling in one or several nodes (buboes).
Pneumonic plague occurs in two distinct and epidemiologically significant forms.
- Secondary plague pneumonia results from the hematogenous spread of Y. pestis to the lungs.
- A primary pneumonic plague patient usually presents with an infectious pneumonitis upon the onset of symptoms.
Septicemic plague can be primary or secondary to bubonic plague. Primary septicemic plague is a progressive, overwhelming bloodstream infection with Y. pestis in the apparent absence of a primary lymphadenopathy.
Other Types of Plagues
- Cellulocutaneous plague
- Meningeal plague
- Pharyngeal plague
- Abortive plague
- Pestis minor
- Asymptomatic plague
- Plague Manual: Epidemiology, Distribution, Surveillance. World Health Organization. Communicable Disease Surveillance and Response and Control. WHO/CDS/CSR/EDC/99.2