Cholera in the Gilbert Island. I. Epidemiological features

Area of Science:

• Epidemiology
• Infectious Diseases
• Environmental Health

Background:

• Cholera outbreaks pose significant threats, particularly in remote regions with limited infrastructure.
• The South and Central Pacific historically has limited experience with explosive cholera epidemics.

Purpose of the Study:

• To document and analyze an explosive cholera epidemic on the coral atoll of Tarawa, Gilbert Islands.
• To identify the primary modes of transmission and contributing environmental factors.
• To assess the risk of future cholera outbreaks in similar Pacific island settings.

Main Methods:

• Epidemiological investigation of the outbreak.
• Microbiological analysis of water and shellfish samples.
• Assessment of environmental conditions conducive to disease spread.

Main Results:

• The outbreak was caused by Vibrio cholerae, biotype El Tor, serotype Inaba.
• Contamination of the main water supply was the principal mode of spread during the peak.
• Tarawa lagoon water and shellfish tested positive for V. cholerae; raw fish and shellfish consumption also transmitted the disease.

Conclusions:

• The Tarawa cholera outbreak highlights the vulnerability of remote Pacific islands to explosive epidemics.
• Environmental factors, including water contamination and seafood consumption, facilitate cholera transmission.
• Urgent attention is needed to prevent and manage potential future outbreaks in poorly equipped island communities.