Diphtheria is a serious but preventable bacterial infection that has again become an important public health concern in Nigeria.
On 28 August 2026, the Federal Government activated an emergency multi-agency task force following a diphtheria outbreak affecting children in parts of Katsina and Kano States. The response involves the Federal Ministry of Health and Social Welfare, Nigeria Centre for Disease Control and Prevention (NCDC), National Primary Health Care Development Agency (NPHCDA), state governments and health partners.
The immediate priorities include strengthening disease surveillance, closing childhood immunisation gaps and ensuring that people who develop diphtheria receive treatment quickly.
For parents and caregivers, the important questions are straightforward: What does diphtheria look like? How does it spread? Who is most at risk? And when should someone with symptoms be taken to a health facility?
What Is Diphtheria?
Diphtheria is an infectious disease caused mainly by toxin-producing strains of the bacterium Corynebacterium diphtheriae.
The infection commonly affects the nose and throat, although it can also affect the skin.
What makes respiratory diphtheria particularly dangerous is not simply the presence of the bacteria. Some strains produce a powerful toxin that damages tissue where the infection occurs and can subsequently affect other organs.
According to the World Health Organization (WHO), the toxin can damage the heart and nerves. Severe respiratory disease can also obstruct the airway.
The good news is that diphtheria is vaccine-preventable.
Why Is Diphtheria Still Occurring in Nigeria?
Diphtheria vaccination has dramatically reduced disease globally, but outbreaks can return when enough people in a community are unvaccinated or incompletely vaccinated.
Nigeria has experienced significant diphtheria transmission in recent years, and the latest response in Katsina and Kano again highlights the importance of maintaining high routine immunisation coverage.
An outbreak does not necessarily mean that vaccines have stopped working.
The larger problem is often an immunity gap: too many children or adults may have missed some or all of the vaccine doses required to provide adequate protection.
Disruption of routine health services, difficulty reaching health facilities, insecurity, population displacement, vaccine hesitancy and other barriers can contribute to these gaps.
This is why responding to an outbreak requires more than treating people who are already sick. Public health teams must also identify susceptible communities and improve vaccination coverage.
How Does Diphtheria Spread?
Diphtheria can spread from one person to another through respiratory droplets produced when an infected person coughs or sneezes.
Transmission can also occur through close contact with infected respiratory secretions or infected skin lesions.
Importantly, some infected people may have few or no obvious symptoms but may still carry and transmit the bacteria.
Close household contacts can therefore be particularly important during an outbreak.
Crowded environments and communities with low vaccination coverage can make sustained transmission easier.
What Are the Symptoms of Diphtheria?
Symptoms usually begin about two to five days after exposure, although presentation can vary.
Early symptoms may resemble those of several other respiratory infections.
They can include:
sore throat;
mild fever;
weakness or tiredness;
swollen glands in the neck;
difficulty swallowing; and
reduced appetite or general illness.
A particularly important warning sign is the development of a thick grey or whitish membrane over the throat or tonsils.
This membrane forms from damaged tissue and can make swallowing or breathing difficult.
Severe swelling of the neck can also occur.
Not everyone with a sore throat has diphtheria. Malaria, viral infections, tonsillitis and several other illnesses can produce fever or throat symptoms.
The presence of compatible symptoms during an outbreak, particularly in someone who is unvaccinated or incompletely vaccinated, should therefore prompt medical assessment rather than self-diagnosis.
The Grey Throat Membrane Is a Medical Warning Sign
The characteristic membrane associated with respiratory diphtheria can adhere tightly to tissue in the throat.
Parents and caregivers should not attempt to scrape or remove it at home.
Doing so can cause bleeding and does nothing to address the toxin-producing infection.
A person with suspected diphtheria needs assessment by trained healthcare professionals.
Difficulty breathing, inability to swallow, severe neck swelling, unusual weakness or rapidly worsening illness should be treated as urgent warning signs.
Why Can Diphtheria Become Dangerous?
The toxin produced by some diphtheria bacteria can move beyond the initial infection site.
One potentially serious complication is myocarditis, which is inflammation and damage involving the heart muscle.
The nervous system can also be affected, potentially producing nerve damage and weakness.
Severe disease may obstruct the airway.
Young children and people without adequate immunity are particularly vulnerable.
WHO notes that without appropriate treatment, diphtheria can be fatal, especially among unvaccinated people and young children.
This is one reason treatment should not be delayed while families experiment with home remedies.
How Is Diphtheria Diagnosed?
Healthcare workers may suspect respiratory diphtheria from symptoms, vaccination history, exposure history and examination of the throat.
Laboratory testing can help confirm whether toxin-producing Corynebacterium bacteria are responsible.
However, suspected diphtheria is a situation in which waiting for every laboratory result before beginning appropriate management may be dangerous.
WHO recommends prompt investigation and early treatment when diphtheria is clinically suspected.
This is particularly important during an active outbreak.
How Is Diphtheria Treated?
Diphtheria requires medical treatment.
Management of respiratory diphtheria commonly involves two important components.
Diphtheria antitoxin
Diphtheria antitoxin helps neutralise toxin that has not yet attached to body tissues.
This is one reason early treatment matters. Antitoxin cannot simply reverse all damage that has already occurred.
Antibiotics
Appropriate antibiotics are used to eliminate the bacteria, reduce further toxin production and reduce transmission to other people.
Additional hospital care may be required depending on the severity of the disease. Someone experiencing airway obstruction, heart complications or neurological problems may require intensive monitoring and supportive treatment.
Antibiotics should not be self-prescribed. Treatment decisions should be made by qualified healthcare professionals, particularly because antimicrobial resistance patterns can influence antibiotic choice.
What Happens to People Who Have Been in Close Contact With a Case?
Public health management does not end with the infected person.
Close contacts may need to be identified and assessed.
Depending on the circumstances, healthcare teams may recommend preventive antibiotics, monitoring for symptoms and vaccination or completion of missing vaccine doses.
WHO specifically recommends checking the immunisation status of close contacts of diphtheria cases.
This is why families should cooperate with contact-tracing and public health teams during an outbreak.
It can help stop one case from becoming several.
Vaccination Is the Best Protection Against Diphtheria
Diphtheria is preventable through vaccination.
The vaccine is usually administered as part of combination vaccines that protect against several childhood diseases.
WHO recommends a primary series of three diphtheria-containing vaccine doses beginning in infancy, followed by booster doses to maintain protection as immunity can decrease over time.
Parents should therefore check their children's immunisation records rather than assuming that a child is fully vaccinated because they received one vaccine as a baby.
If doses have been missed, a health worker can advise on appropriate catch-up vaccination.
A missed vaccine does not mean parents should abandon the schedule entirely.
Can a Vaccinated Person Still Get Diphtheria?
Vaccination substantially reduces the risk of disease and severe outcomes, but protection can decrease over time, which is why booster doses are important.
No vaccine provides perfect protection to every individual.
However, maintaining high vaccination coverage across a community makes it much harder for diphtheria to spread and protects people who are particularly vulnerable.
The appropriate conclusion is therefore not that vaccination is unnecessary because occasional breakthrough infections can occur.
It is the opposite: sustained population immunity is one of the main reasons diphtheria can be controlled.
What Should Parents Do During a Diphtheria Outbreak?
First, check children's immunisation records.
If you are unsure whether a child has completed the recommended vaccinations, speak with a healthcare worker or visit an appropriate primary healthcare facility.
Second, pay attention to symptoms, particularly when someone has had close contact with a suspected or confirmed case.
Third, do not rely on antibiotics bought without medical assessment or attempt to treat a suspicious throat membrane at home.
Fourth, cooperate with health authorities if someone in the household is diagnosed with diphtheria. Contact identification and preventive treatment can interrupt further transmission.
Finally, seek medical attention promptly when symptoms are concerning.
When Should You Seek Urgent Medical Care?
Seek urgent medical assessment if a child or adult develops:
difficulty breathing;
difficulty swallowing;
a thick grey or white membrane in the throat;
significant neck swelling;
rapidly worsening weakness;
signs of severe illness; or
compatible symptoms following close contact with a confirmed or suspected diphtheria case.
During an outbreak, healthcare workers should also be told about possible exposure and the person's vaccination history.
What Nigeria's Latest Outbreak Tells Us
The current outbreak in parts of Katsina and Kano is not simply a story about one bacterium.
It highlights a broader public health challenge.
Vaccines can prevent diseases only when people can actually receive them.
Routine immunisation therefore depends on functioning primary healthcare facilities, adequate vaccine supply, trained health workers, community trust, effective surveillance and systems capable of identifying children who have missed vaccinations.
Emergency vaccination campaigns can help control outbreaks, but consistently high routine immunisation coverage is what prevents immunity gaps from accumulating in the first place.
Nigeria's response should therefore be judged not only by whether the current outbreak is contained, but also by whether fewer children remain susceptible afterwards.
Frequently Asked Questions
Is diphtheria the same as tonsillitis?
No. Several infections can cause sore throat and swollen tonsils. Diphtheria is caused by particular toxin-producing bacteria and can cause a characteristic adherent grey or white membrane. Medical evaluation is necessary when diphtheria is suspected.
Can adults get diphtheria?
Yes. Diphtheria is not exclusively a childhood disease. Anyone without sufficient immunity can potentially become infected.
Can diphtheria be treated at home?
Suspected respiratory diphtheria should not be managed solely at home. The disease can progress rapidly and may require antitoxin, antibiotics and hospital care.
Does recovering from diphtheria mean vaccination is no longer necessary?
No. WHO recommends vaccination after recovery because infection does not necessarily provide reliable long-term immunity.
Is diphtheria preventable?
Yes. Maintaining high vaccination coverage is the most effective way to prevent diphtheria and control outbreaks.
Final Takeaway
Diphtheria is dangerous, but it is also preventable.
Nigeria's latest outbreak response in Katsina and Kano is another reminder that vaccine-preventable diseases can return when immunity gaps develop.
Parents do not need to panic, but they should take the disease seriously.
Check children's immunisation status. Recognise warning signs. Do not attempt to treat suspected diphtheria with home remedies. And when breathing or swallowing becomes difficult, a grey or white throat membrane develops, or illness worsens rapidly, seek medical care immediately.
Early recognition, appropriate treatment, vaccination and effective public health follow-up can prevent deaths and stop transmission.
References
Federal Ministry of Health and Social Welfare, Nigeria. (2026, August 28). FG activates emergency task force to respond to diphtheria outbreak in Katsina, Kano.
World Health Organization. (2026). Diphtheria. WHO Fact Sheet.
World Health Organization. (2024). Clinical management of diphtheria: guideline.
World Health Organization. (2023). Diphtheria: Questions and answers.
World Health Organization. Immunization, vaccines and biologicals: Diphtheria.
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