A Warning That Often Goes Unheard
Outbreaks rarely announce themselves loudly.
They begin quietly, a fever dismissed as malaria, a headache ignored, fatigue blamed on stress. In homes across Nigeria, these early signs appear ordinary. That is what makes Lassa fever dangerous. By the time it is recognized, the virus may already be spreading.
Lassa fever is not new. It has existed in Nigeria for decades. But each outbreak reminds us of a difficult truth: infectious diseases thrive where awareness, prevention, and early action are delayed. Like many public health emergencies, the real danger lies not just in the virus itself, but in the warnings that go unnoticed.
What Is Lassa Fever?
Lassa fever is an acute viral haemorrhagic illness caused by the Lassa virus. It is endemic in several West African countries, including Nigeria, and occurs throughout the year, with higher transmission during the dry season.
The virus is primarily carried by the multimammate rat (Mastomys natalensis), a rodent commonly found in homes and food storage areas. Humans become infected through contact with food, household items, or surfaces contaminated with the rat’s urine or droppings.
Once symptoms begin, the virus can also spread from person to person through contact with bodily fluids, especially in healthcare settings where infection control measures are inadequate.
Why the Current Outbreak Matters
Although the overall case-fatality rate of Lassa fever is about 1%, the risk increases significantly in severe cases. Among hospitalized patients, fatality rates can reach 15%. Pregnant women face particularly devastating outcomes, with a high risk of miscarriage and fetal loss.
Most concerning is that about 80% of infected individuals experience mild or no symptoms, allowing the virus to circulate silently within communities.
This makes public awareness and early response essential.
Signs and Symptoms to Watch For
Lassa fever symptoms typically appear 1 to 3 weeks after infection. Early symptoms are often mild and nonspecific, which is why they are frequently overlooked.
Early symptoms include:
- Slight fever
- Fatigue and weakness
- Headache
Severe symptoms may include:
- Vomiting or diarrhea
- Bleeding from the mouth, nose, or other body openings
- Difficulty breathing
- Facial swelling
- Chest, back, or abdominal pain
- Shock
One of the most serious long-term complications is hearing loss, which can occur even in mild cases and may be permanent.
Anyone experiencing persistent fever that does not respond to routine treatment should seek medical care immediately.
How Lassa Fever Spreads
Lassa fever is not spread through casual contact such as hugging, shaking hands, or sitting near someone who is infected.
Transmission occurs through:
- Eating food contaminated by rodent urine or droppings
- Touching contaminated household items
- Breathing in particles during sweeping or cleaning
- Contact with open cuts or sores
- Contact with the bodily fluids of an infected person after symptoms begin
Healthcare workers are especially at risk if proper personal protective equipment (PPE) and sterilization procedures are not followed.
How to Protect Yourself and Your Family
Prevention begins at home.
Reduce Rodent Exposure
- Store food in rat-proof containers
- Keep homes clean and dispose of waste properly
- Avoid drying food on the ground
- Do not eat rodents
Practice Safe Hygiene
- Wash hands regularly with soap and water
- Clean surfaces frequently
- Avoid sweeping dry floors; damp-clean instead
Seek Early Medical Care
- Do not self-medicate persistent fevers
- Visit a health facility if symptoms worsen
- Inform healthcare providers of any possible exposure
Healthcare providers should strictly follow infection prevention and control measures, including patient isolation when necessary.
Why Early Action Saves Lives
There is no widely available vaccine for Lassa fever. Survival depends largely on early diagnosis and supportive care, including rehydration and symptom management.
The difference between recovery and tragedy is often timing.
When communities recognize symptoms early, limit exposure, and seek care promptly, outbreaks can be contained. When warnings are ignored, consequences escalate.
Lassa fever is not just a medical issue, it is a public health responsibility. Awareness, cleanliness, and timely action protect not only individuals but entire communities.
Outbreaks remind us that safety often depends on what we choose to take seriously and how quickly we respond.
Staying informed is not fear. It is protection.