Meningitis is an infection that affects the protective membranes surrounding the brain and spinal cord. It can be caused by viruses, fungi, or bacteria, but bacterial meningitis is the most severe and accounts for the majority of deaths and long-term complications associated with the disease.
According to the World Health Organisation (WHO), meningitis remains a major health concern in sub-Saharan Africa, particularly within the region known as the “meningitis belt.” This belt stretches from Senegal in West Africa to Ethiopia in the east and experiences frequent outbreaks due to climatic and environmental conditions. Nigeria lies squarely within this zone, making it especially vulnerable to recurring epidemics.
Health experts explain that the bacteria responsible for meningitis can live harmlessly in the nose and throat of healthy individuals. Transmission typically occurs through respiratory droplets or throat secretions during close contact such as coughing, sneezing, or prolonged interaction in crowded environments.
Although many carriers never develop symptoms, the bacteria can sometimes invade the bloodstream and travel to the brain, causing meningitis or a severe bloodstream infection known as sepsis.
While people of all ages can contract the disease, children and adolescents are particularly at risk. Data from recent outbreaks in Nigeria indicate that children between the ages of five and fourteen represent the most affected group.
Nigeria has recorded several outbreaks of cerebrospinal meningitis over the years, underscoring the persistent burden of the disease. During the 2023/2024 meningitis season, the country reported 3,644 suspected cases and 306 deaths. The figures highlight the continuing threat posed by the disease despite ongoing prevention efforts.
The situation remained significant in the following season. As of April 6, 2025, Nigeria had documented 2,911 suspected cases and 225 deaths across 24 states, representing a case fatality rate of 7.7 per cent.
Public health experts attribute the seasonal rise in infections partly to the dry and dusty conditions that occur during the harmattan period. These environmental conditions can irritate the respiratory tract, making individuals more susceptible to infection while also aiding the spread of bacteria.
Amid these concerns, the Nigeria Centre for Disease Control and Prevention (NCDC) has issued a fresh public health advisory warning Nigerians about the heightened risk of cerebrospinal meningitis during the peak of the dry season.
In a statement signed by the Director-General of the agency, Dr. Jide Idris, the NCDC noted that meningitis cases typically increase between December and April when dry weather, dust, overcrowding, and poor ventilation create favourable conditions for transmission, particularly in states within the African meningitis belt.
The agency warned that the disease can progress very quickly if not treated promptly.
“Meningitis can progress rapidly and may be fatal within hours if untreated,” the advisory stated, urging Nigerians to remain vigilant and seek medical attention immediately when symptoms appear.
According to the NCDC, cerebrospinal meningitis is most commonly caused by the bacterium Neisseria meningitidis. The infection spreads through respiratory droplets, especially in crowded settings or poorly ventilated environments where people have close contact.
Early symptoms often include sudden high fever, severe headache, and stiffness of the neck. Other warning signs may include vomiting, sensitivity to light, confusion, seizures, and difficulty concentrating.
Infants may show different symptoms such as irritability, refusal to feed, excessive crying, or a bulging soft spot on the head.
Health officials also caution Nigerians not to assume that fever and headache during the dry season are automatically signs of malaria. Instead, individuals experiencing such symptoms are advised to seek immediate medical evaluation.
Certain groups are considered to be at higher risk of infection. These include children, young adults, individuals with weakened immune systems, and people living in overcrowded environments. Institutions such as schools, boarding houses, universities, internally displaced persons (IDP) camps, religious centres, and correctional facilities have also been identified as high-risk settings that require heightened surveillance.
To reduce the risk of infection, the NCDC has advised Nigerians to seek early medical care and avoid self-medication or reliance on unverified herbal remedies. The agency also recommends improving ventilation in homes and public spaces, avoiding overcrowded environments where possible, covering the mouth when coughing or sneezing, and refraining from sharing cups or eating utensils.
Vaccination remains one of the most effective ways to prevent meningitis. The NCDC encourages residents to participate in government-led vaccination campaigns whenever they are conducted in their communities.
The agency added that it is working closely with state ministries of health to strengthen disease surveillance, expand laboratory capacity, and ensure timely detection of cases. Other ongoing interventions include the deployment of Rapid Response Teams to affected areas, improved case management, and public awareness campaigns aimed at educating communities about the disease.
Health authorities emphasise that emergency medical care should be sought immediately when symptoms such as fever occur alongside neck stiffness, confusion, seizures, or rapidly worsening illness, as early treatment significantly improves survival.