Epidemiology – Transmission
- Transmission occurs through:
- the bite of an infected flea,
- respiratory droplets, or
- direct contact with a patient infected with pneumonic
- Transmission by direct skin or mucous membrane contact with
tissues and fluids of infected animals is less common.
- Infection via inhalation of infective respiratory droplets
or aerosols is rare with naturally occurring plague in the United
States, but is the most likely route of transmission in a bioterrorist
- Becoming infected via inhalation requires direct and close
(within 6 feet) contact with an ill person or animal and has
not occurred in the United States for decades.