Floods, Cholera and Typhoid: What Communities Need to Know

Ghana has experienced its heaviest monthly rainfall since 1995, triggering severe flooding across Accra and surrounding communities. Beyond the immediate destruction, health authorities are warning of a second wave of danger: possible outbreaks of cholera and typhoid fever in the weeks ahead.

What Are Cholera and Typhoid?

Cholera and typhoid are both bacterial infections spread through contaminated water and food. Neither spreads through casual person-to-person contact. The risk arises when drinking water, food, or surfaces are exposed to floodwater contaminated with sewage, refuse, and human waste.

Cholera, caused by the bacterium Vibrio cholerae, strikes suddenly and severely. It causes acute watery diarrhoea and vomiting, and without prompt treatment can lead to fatal dehydration within hours.

Typhoid, caused by Salmonella Typhi, develops more gradually over one to three weeks. It presents with prolonged high fever, weakness, headache, and abdominal pain. While slower in onset, it can be equally dangerous if not treated early.

Why Flooding Raises the Risk

Flooding creates ideal conditions for both diseases:

Broken pipes and contaminated open wells

Sachet water and street food exposed during storage or transport

Vegetables grown near flooded areas carrying contamination to consumers

Displacement and overcrowding in shelters increasing transmission risk

Stagnant water increasing mosquito breeding and malaria risk

How These Infections Are Diagnosed

Diagnosis often begins with clinical assessment, as treatment cannot always wait for laboratory confirmation.

For cholera, sudden watery diarrhoea—sometimes described as “rice water” stool—alongside vomiting during a known outbreak is usually enough to begin treatment immediately. Stool samples may later confirm the diagnosis through rapid testing or culture. Clinicians primarily assess dehydration by checking skin turgor, eyes, pulse, and blood pressure to guide urgent care.

Typhoid is suspected when a patient develops persistent fever over several days, often with headache, abdominal pain, and sometimes a relatively slow pulse.

Blood culture remains the most reliable test, particularly in the first week of illness. However, in Ghana, the Widal test is commonly used as a quicker alternative. It detects antibody responses and can return results within hours, making it useful in primary and district-level care.

However, the Widal test has important limitations. It can produce false positives due to malaria, other Salmonella infections, past exposure, or prior vaccination. It may also miss early infections before antibodies rise. For this reason, a single result is not considered definitive and should be interpreted alongside clinical signs. Where possible, a repeat test after about a week may help confirm rising antibody levels, though blood culture remains the gold standard.

Warning Signs That Require Urgent Care

Seek immediate medical attention if any of the following occur:

Profuse watery diarrhoea

Persistent vomiting

Sunken eyes or extreme thirst

Little or no urination

These may indicate cholera and require emergency rehydration treatment.

For typhoid, warning signs include:

Persistent or worsening fever

Severe headache

Abdominal pain

Skin rash in some cases

Both conditions are treatable with timely care—oral or IV rehydration for cholera, and antibiotics for both cholera and typhoid. Delays in treatment significantly increase risk.

Protecting Households During and After Flooding

Prevention remains the most effective defence, especially in the days following floods:

Boil drinking water or use safe bottled/sachet water

Eat only freshly cooked, hot food

Avoid raw vegetables unless their safety is certain

Wash hands thoroughly with soap and clean running water

Avoid wading through floodwater where possible

Dispose of waste properly and keep it away from water sources

Clear stagnant water and blocked drains around homes

The Ghana Health Service has reinforced these measures in recent public advisories, urging residents to maintain strict hygiene practices and seek medical care promptly rather than waiting for symptoms to resolve.

Floodwaters may recede quickly, but the health risks they leave behind can persist for weeks if preventive measures are not strictly observed.