🦟 Men's Health

Dengue Fever in Nigeria

Q: How can I tell if I have dengue or malaria?

Both cause fever, headache, chills, and body aches. Dengue tends to cause more severe joint and bone pain ('breakbone fever'), pain behind the eyes (retro-orbital), and a characteristic rash. Malaria tends to have more cyclic fever and less severe bone pain. Thrombocytopaenia occurs in both. The only reliable distinction is testing — dengue NS1 antigen and malaria RDT should both be done when dengue is possible.

Q: Is dengue vaccine available in Nigeria?

The dengue vaccine (Dengvaxia) is approved in some countries — however, it is only recommended for people who have had a previous dengue infection (seropositive individuals) because vaccination of seronegative individuals can increase severe disease risk on subsequent natural infection. It is not currently recommended for Nigeria's general population and is not widely available in the country.

Q: Can dengue kill you?

Severe dengue (dengue haemorrhagic fever or dengue shock syndrome) can be fatal — but with good supportive care, case fatality rates are < 1%. The key is recognising warning signs early and ensuring adequate IV fluid management in hospital. Most people with dengue recover fully from the acute illness within 1–2 weeks.

Q: Will my platelet count recover after dengue?

Yes — platelet counts typically fall to a nadir around day 5–7 of illness then recover rapidly over the following 3–5 days as the immune response resolves. By 2 weeks after illness onset, platelets are usually fully normal. You should avoid aspirin and NSAIDs until platelet count is confirmed to have recovered.

A growing viral illness spread by the same mosquito as yellow fever

Dengue fever is a viral infection transmitted by the Aedes aegypti mosquito — the same mosquito that spreads yellow fever and Zika virus. Once thought uncommon in Nigeria, dengue is increasingly recognised — surveillance studies have found seroprevalence rates of 20–60% in some Nigerian cities, indicating widespread past exposure with most infections going undiagnosed. There are four dengue serotypes (DENV1–4); infection with one provides lifelong immunity to that serotype but subsequent infection with a different serotype carries higher risk of severe dengue (dengue haemorrhagic fever). There is no specific antiviral treatment — management is supportive — making prevention essential.

Signs and Symptoms

✓ Classic dengue fever ('breakbone fever'): sudden high fever (39–40°C), severe headache, pain behind the eyes (retro-orbital pain), severe muscle and joint pain (hence 'breakbone'), nausea and vomiting

✓ Rash: maculopapular rash appearing 3–5 days after fever onset — often described as 'islands of white in a sea of red'

✓ Usually lasts 5–7 days then resolves

✓ WARNING signs of severe dengue: abdominal pain, persistent vomiting, bleeding from gums or nose, blood in stool or urine, rapid breathing, restlessness or lethargy — require emergency hospital admission

✓ Dengue vs. malaria: dengue has more severe bone/joint pain, retro-orbital headache, and rash. Both cause fever and thrombocytopaenia — test for both in endemic areas

Risk Factors

Aedes aegypti bites during the day — unlike malaria mosquitoes which bite at night
Urban environments: Aedes breeds in small water collections — flower pots, tin cans, blocked gutters, water drums in urban areas
Wet season (May–October in most of Nigeria)
Second dengue infection with a different serotype — highest risk of severe disease
Very young, elderly, pregnant, or immunosuppressed individuals — higher risk of severe course
Dengue is increasingly circulating in Lagos, Abuja, Ibadan, Port Harcourt — urban centres

When to Seek Help

High fever + severe joint/bone pain + retro-orbital headacheClassic dengue presentation — test for dengue and malaria simultaneously

Warning signs of severe dengueAbdominal pain, persistent vomiting, bleeding, rapid breathing — hospital admission immediately for IV fluid management

Falling platelet count detected on FBCThrombocytopaenia is a hallmark — monitor closely for haemorrhagic complications

Fever not responding to antimalarialsConsider dengue if malaria tests are negative

Second dengue illnessEnhanced monitoring — secondary infection has higher severe disease risk

Tests & Diagnosis

🧪 Dengue NS1 antigen rapid test

Detects dengue virus antigen in blood — positive in first 5 days of illness. Increasingly available in Nigerian hospitals and laboratories

🧪 Dengue IgM/IgG antibody

Detectable from day 5–6 onwards. IgM = current/recent infection. IgG = past infection or secondary infection (high IgG:IgM ratio)

🧪 Full blood count

Leucopaenia (low white cells) + thrombocytopaenia (falling platelets < 100,000) are classic. Serial platelet monitoring is essential in confirmed dengue

🧪 Haematocrit

Rising haematocrit (> 20% increase from baseline) = plasma leakage = warning sign of severe dengue requiring IV fluids

🧪 Liver function tests

Transaminases often elevated in dengue — severe dengue can cause acute liver failure

🧪 Malaria RDT or blood film

Always test simultaneously — dengue and malaria coexist in Nigeria and can both cause fever and thrombocytopaenia

Treatment Options

No specific antiviral treatment for dengue

Management is entirely supportive — the immune system clears the virus

Fever and pain management

Paracetamol (acetaminophen) ONLY — never aspirin or NSAIDs (ibuprofen, diclofenac). Aspirin and NSAIDs increase bleeding risk in dengue by further reducing platelet function. This is a critical safety point

Oral rehydration

Encourage oral fluids — water, ORS solution, coconut water, dilute fruit juice. Monitor for signs of dehydration

Warning signs monitoring

Check platelets daily once < 100,000. Monitor haematocrit. Watch for warning signs — if present, hospital admission for IV fluid therapy

IV fluid therapy for severe dengue

Crystalloid (normal saline or Ringer's lactate) infusion titrated to clinical response — the cornerstone of severe dengue management. Avoid excessive IV fluids (causes fluid overload as plasma leakage phase resolves)

Platelet transfusion

Only for significant active bleeding with very low platelets (< 10,000) — NOT routinely for low platelets without bleeding

Mosquito control to prevent spread

Remove standing water from containers around the home. Use insecticide-treated nets (though Aedes bites during the day). DEET repellent. Aedes control is an urban public health priority

Frequently Asked Questions

How can I tell if I have dengue or malaria?

Both cause fever, headache, chills, and body aches. Dengue tends to cause more severe joint and bone pain ('breakbone fever'), pain behind the eyes (retro-orbital), and a characteristic rash. Malaria tends to have more cyclic fever and less severe bone pain. Thrombocytopaenia occurs in both. The only reliable distinction is testing — dengue NS1 antigen and malaria RDT should both be done when dengue is possible.

Is dengue vaccine available in Nigeria?