Cholera

Cholera is an acute diarrhoeal infection caused by ingestion of food or water contaminated with the bacterium Vibrio cholerae. Approximately 1 - 4 million cases occur globally each year.

Transmission

• Cholera is transmitted through the faecal-oral route, by ingestion of faecally contaminated water and occasionally foodstuffs, particularly shellfish.
• Transmission is closely linked to inadequate environmental management where minimum requirements of clean water and sanitation are not met.
• Humans are the only known hosts.
• Bacteria can survive for weeks to months in water.
• High infecting dose required to cause disease.

Vaccine Schedule

Transmission

Reported from all world regions.

Two serogroups of V. cholerae are responsible for outbreaks, 01 (found worldwide) and 0139 (confined to SE Asia); 01 is responsible for most recent outbreaks.

Recently new variant strains have been seen in Africa and Asia which are thought to be causing more severe cholera with higher case fatality rates.

Epidemics likely to occur where sanitation and water systems are disrupted or inadequate e.g. urban slums, refugee camps and following natural disasters and floods.

Signs and Symptoms

• 75% infected will be asymptomatic.
• 80% symptomatic have mild - moderate diarrhoea.
• 20% - acute watery diarrhoea (rice water stool) +/- vomiting.
• May lose ~ 30 litres fluid in 24 hours, resulting in profound dehydration and death.
• Fever, abdominal pain unusual.

RISK AREA MAP - CHOLERA

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