Lassa Fever: Everything You Need to Know About the Deadly Viral Disease
Lassa fever is a serious viral illness that affects thousands of people every year in West Africa, including Nigeria.
The disease is caused by the Lassa virus and is primarily spread through contact with infected rodents or contaminated materials. Because outbreaks occur frequently in Nigeria, understanding how the disease spreads and how to prevent it is extremely important.
What is Lassa Fever?
Lassa fever is an acute viral hemorrhagic illness first discovered in 1969 in Lassa town, Borno State, Nigeria. The disease belongs to the Arenavirus family and is endemic in several West African countries including Nigeria, Sierra Leone, Liberia, and Guinea.
According to the World Health Organization (WHO), hundreds of thousands of infections occur each year in West Africa, with thousands of deaths annually.
The disease ranges from mild illness to severe life-threatening complications, particularly if it is not treated early.
What Causes Lassa Fever?
Lassa fever is caused by the Lassa virus, which is carried by a type of rat known as the multimammate rat (Mastomys natalensis).
These rodents are very common in many African households and farms.
How Infection Occurs
Humans can become infected through:
Eating food contaminated with rat urine or droppings
Contact with infected rats or their body fluids
Inhaling particles contaminated with the virus
Person-to-person transmission through blood, saliva, urine, or other body fluids
Exposure in healthcare settings without proper protective equipment
Healthcare workers are particularly at risk when infection prevention measures are not strictly followed.
Signs and Symptoms of Lassa Fever
Symptoms usually appear 6 to 21 days after exposure to the virus.
Early Symptoms
The early stage often looks like malaria or typhoid, making diagnosis difficult.
Common symptoms include:
Fever
General weakness
Headache
Sore throat
Muscle pain
Chest pain
Nausea and vomiting
Diarrhea
Abdominal pain
Severe Symptoms
In some patients, especially when treatment is delayed, more serious complications may occur:
Facial swelling
Bleeding from mouth, nose, or gums
Difficulty breathing
Persistent vomiting
Hearing loss
Seizures
Shock or organ failure
One of the long-term complications of Lassa fever is permanent hearing loss, which can occur even after recovery.
How Lassa Fever Spreads
The most common source of infection is contact with infected rodents.
Major Transmission Routes
1.Rodent-to-Human Transmission
Through food contaminated by rat urine or feces
Handling or consuming infected rats
2.Human-to-Human Transmission
Contact with body fluids of an infected person
Through contaminated medical equipment
3. Hospital Transmission
Occurs when healthcare workers lack proper protective equipment such as gloves, masks, and gowns.
Who is Most at Risk?
People living in areas with poor sanitation and high rodent populations are more vulnerable.
High-risk groups include:
People living in rural areas
Farmers and food storage workers
Healthcare workers
Family members caring for infected patients
Individuals living in overcrowded homes
Diagnosis of Lassa Fever
Early diagnosis is critical for survival.
Medical personnel diagnose Lassa fever through laboratory tests, which may include:
PCR tests to detect the virus
Blood tests
Antibody tests
Because symptoms resemble other diseases like malaria, typhoid fever, and Ebola, laboratory confirmation is essential.
Treatment of Lassa Fever
The main treatment for Lassa fever is the antiviral medication Ribavirin.
Treatment is most effective when given early, ideally within the first six days of illness.
Patients may also receive supportive care such as:
Intravenous fluids
Oxygen therapy
Blood pressure monitoring
Treatment for secondary infections
Severe cases are treated in isolation units to prevent transmission.
Prevention of Lassa Fever
Since there is currently no widely available vaccine, prevention focuses on avoiding contact with rodents and infected individuals.
Key Prevention Measures
1. Control Rodents
Store food in rodent-proof containers
Keep homes clean
Dispose of garbage properly
2. Improve Hygiene
Wash hands regularly with soap and water
Keep cooking areas clean
3. Avoid Contact with Rats
Do not eat rats
Prevent rodents from entering homes
4. Protect Healthcare Workers
Use personal protective equipment (PPE)
Follow infection control protocols
Lassa Fever in Nigeria
Nigeria experiences seasonal outbreaks, especially during the dry season between November and April.
The Nigeria Centre for Disease Control (NCDC) continuously monitors cases and provides public health guidance to control outbreaks.
Several states, including Edo, Ondo, Bauchi, Taraba, and Ebonyi, frequently report cases.
When to Seek Medical Help
Anyone experiencing persistent fever that does not respond to malaria treatment, especially in areas with Lassa fever outbreaks, should seek medical care immediately.
Early treatment can greatly increase survival chances.
Key Takeaways
Lassa fever is a serious viral disease common in West Africa.
It spreads mainly through contact with infected rodents or body fluids of infected individuals.
Early symptoms resemble malaria or typhoid, making diagnosis challenging.
Early treatment with Ribavirin saves lives.
Prevention foc
uses on rodent control, good hygiene, and infection prevention measures.
Public awareness is crucial in preventing Lassa fever outbreaks.
Simple measures like keeping homes clean, storing food properly, and seeking early medical care can save lives.
