Nigeria’s public health agency, the NCDC, on Thursday issued a nationwide warning that the country is experiencing a concerning rise in cholera, yellow fever and dengue—linked to the ongoing July flood season, affecting more states across the South and North. The alert, titled “Protecting public health during flood season…”, was signed by Director General Dr Jide Idris and emphasised the urgent need for coordinated national measures.
The Nigerian Meteorological Agency (NiMet) has issued flash flood warnings for July, identifying Sokoto as high risk and a further 18 states—including Lagos, Edo, Benue, Rivers, Cross River, Akwa Ibom—as moderately threatened. The NCDC stressed that such floods can contaminate water sources with pathogens from soil, sewage and animal waste—creating ideal conditions for cholera outbreaks. Additionally, stagnant water provides breeding grounds for mosquitoes that transmit yellow fever, dengue, and malaria.
According to the alert, 34 states have reported cholera cases as of June, with Zamfara contributing nearly a third of suspected infections. Bayelsa, Adamawa, Delta, Lagos and Rivers were also heavily affected.
Yellow fever, a viral illness transmitted by mosquitoes, has seven confirmed cases across six states—Abia, Anambra, Edo, Ekiti, Lagos and Rivers—triggering outbreak-level response (a single confirmed case is classed as an outbreak), though no fatalities have been recorded to date . Meanwhile, NCDC confirmed a dengue outbreak in Edo State from 9–13 June, following laboratory confirmation .
Dr Idris stated that the NCDC is working closely with state governments, health partners and communities to escalate surveillance, provide treatment supplies, deploy rapid response teams, and launch comprehensive community engagement and communications campaigns to mitigate these evolving threats.
⚠️ Public health advice from NCDC
To curb the spread of waterborne and vector-borne diseases, residents are urged to:
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Boil or disinfect drinking water; store it in clean, sealed containers
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Dispose of waste properly, avoid open defecation, and maintain hand hygiene
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Drain stagnant water in homes and public spaces; clean and cover water-storage units
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Use insecticide-treated nets, repellents, and wear protective clothing
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Vaccinate against yellow fever—the most effective preventive measure
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Seek prompt medical care if symptoms such as high fever, headaches, joint pain, sore throat or swollen glands present
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Healthcare workers should consider dengue in differential diagnoses and adhere to infection control guidelines.
Analysis
Nigeria’s expanding flood zone is fuelling a dangerous cocktail of public health challenges—waterborne cholera outbreaks aggravated by polluted supplies, and mosquito-borne infections thriving in floodwater breeding sites. Complicating matters is the simultaneous presence of other conditions such as Mpox and diphtheria, which burden the country’s strained public health systems .
The NCDC’s integrated response—combining surveillance, vaccination drives, and community awareness campaigns—is vital. Yet, the success of these efforts hinges on sustained sanitation infrastructure, coordinated government action, and public compliance. The window for containment narrows as flood peaks threaten to exacerbate transmissions.
NCDC’s alert underlines that prevention must start at the household level—and rise through a multi-agency response involving meteorologists, health officials and civil society—to avert a crisis unfolding at the intersection of flood and disease.
