Occurrence key: yellow = low, orange = medium, and red = high
Transmission: Through ingestion of vibrio-contaminated water, food
Reservoir: Zooplankton; outbreaks have been associated with phytoplankton blooms, which follow increases in sea surface temperatures and nutrient levels; it is hypothesized that the vibrios that are attached in a dormant state to zooplankton become active in warmer waters and are then carried by currents and tides to areas of human habitation
Occurrence (1997)
Occurrence key:
yellow
= low,
orange
= medium, and
red
= high
Cholera distribution map derived from WHO Global Cholera Update 1997.
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