Why it matters
A patient comes back from abroad with fever — the rookie reflex is “probably flu or gastro.” But in emergency medicine, fever in a traveler is malaria until proven otherwise. Missing it can be fatal within hours. Always keep your global hat on: the world travels, and so do diseases.
1) The 30-second story
- Recent travel (within weeks–months) to an endemic area: Sub-Saharan Africa, Southeast Asia, South America.
- Symptoms: fever (often intermittent), chills, sweats, headache, myalgias, GI upset.
- The dangerous part: malaria can look like viral gastro or flu — until multi-organ failure sets in.
2) Quick differential
- Infections by geography
- Africa: Malaria (Plasmodium falciparum), Ebola/Lassa (rare but deadly), typhoid.
- Asia: Dengue, chikungunya, typhoid, malaria.
- South America: Dengue, Zika, yellow fever, malaria.
- Always consider:
- COVID, influenza (still common!)
- Traveler’s diarrhea (E. coli, Campylobacter, Salmonella)
- Hepatitis A/E
- TB reactivation
3) Red flags 🚨
- Travel to malaria-endemic country with any fever.
- Altered mental status (cerebral malaria).
- Hypotension, jaundice, severe anemia.
- Bleeding/bruising → viral hemorrhagic fevers, DIC.
- Pulmonary edema or ARDS.
- Splenomegaly, hepatomegaly.
4) Bedside exam & first steps
- Vitals: fever spikes, tachycardia, hypotension.
- Look for: jaundice, petechiae/purpura, dehydration.
- Neuro: GCS — cerebral malaria is a killer.
- Isolation precautions if hemorrhagic fever is even a remote possibility.
5) Investigations
- CBC: anemia, thrombocytopenia.
- BMP/LFTs: renal or hepatic involvement.
- Thick & thin peripheral smears: gold standard for malaria (repeat if negative but suspicion high).
- Rapid diagnostic malaria antigen test (if available).
- Blood cultures: typhoid, bacteremia.
- Viral serologies if indicated (dengue, chikungunya).
- CXR: rule out pneumonia, ARDS.
6) Management in the ED
- If malaria suspected
- Treat as falciparum until proven otherwise.
- Start IV artesunate (preferred) or IV quinine if artesunate unavailable (per WHO guidelines).
- Admit all suspected falciparum malaria cases.
- Supportive care
- IV fluids (careful with overload in ARDS).
- Correct hypoglycemia, electrolytes.
- Antipyretics for comfort.
- If dengue suspected: avoid NSAIDs (bleeding risk), monitor platelets, fluids carefully.
- Empiric antibiotics for undifferentiated severe febrile illness if unstable (cover typhoid, sepsis).
7) Disposition
- Admit: any suspected malaria, systemic toxicity, altered mental status, hemodynamic instability, thrombocytopenia, or if reliable follow-up cannot be ensured.
- Safe discharge: only if mild, clear viral diagnosis (e.g., flu, URI), normal labs, stable vitals, and no red flags. Returning travelers should be followed closely — low threshold to admit.
Rookie pearls
- Always ask: “Where have you traveled in the last 6 months?”
- Fever + travel = malaria until ruled out.
- A negative smear doesn’t exclude malaria — repeat in 12–24h.
- Don’t give NSAIDs in possible dengue → bleeding risk.
- Never reassure yourself with “probably viral” in a traveler — investigate thoroughly.
Common pitfalls
- Not asking about travel history.
- Relying on a single negative malaria smear.
- Discharging with “viral gastroenteritis” when malaria was the cause.
- Forgetting isolation in possible hemorrhagic fever exposures.
- Treating dengue like flu and giving NSAIDs.
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