Chikungunya Fever: Diagnosis, Differentials, and Management Guidelines
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1. 👁️🗨️ Signs & Symptoms (Clinical Presentation)
| System | Findings |
| Systemic | High-grade fever (acute onset), chills |
| Musculoskeletal | Severe polyarthralgia (bilateral, symmetric, especially hands, wrists, ankles), may persist for weeks to months |
| Dermatologic | Maculopapular rash (trunk/extremities), pruritic |
| Ocular | Conjunctivitis (non-purulent) |
| Neurologic (severe cases) | Encephalitis, seizures, Guillain-Barré (rare) |
| GI | Nausea, vomiting, abdominal pain |
| Others | Headache, retro-orbital pain, fatigue |
2. 🔬 Investigations
A. 🧪 Specific (Virologic)
| Test | Timing | Result |
| RT-PCR for Chikungunya | Day 1–5 | Detects viral RNA |
| Chikungunya IgM | After Day 5 | Confirms recent infection |
| Chikungunya IgG | Week 2+ | Confirms past exposure |
Note: ELISA for IgM/IgG is standard in many low-resource settings.
B. 🧪 Non-Specific
| Test | Result |
| CBC | Leukopenia, mild thrombocytopenia |
| CRP/ESR | ↑ inflammation |
| LFT | Mild AST/ALT elevation |
| Creatinine | Dehydration risk |
| Dengue NS1/IgM/IgG | Co-infection exclusion |
| Zika RT-PCR | In pregnant patients |
| Malaria smear | Endemic areas |
3. 🧠 Diagnosis Criteria
A. Suspected Case
- Acute fever + arthralgia + epidemiological exposure (travel/residence in endemic area)
B. Probable Case
- Above + positive Chikungunya IgM or RT-PCR
C. Confirmed Case
- RT-PCR or IgM seroconversion (IgG also useful in serial testing)
4. 🔄 Differentiation Table: Chikungunya vs Dengue vs Zika vs Yellow Fever
| Feature | Chikungunya | Dengue | Zika | Yellow Fever |
| Fever | High-grade | High | Low/moderate | High |
| Joint pain | Severe (disabling) | Mild | Mild | Rare |
| Rash | Yes | Yes (petechiae possible) | Yes | Occasionally |
| Bleeding | Rare | Common (hemorrhagic) | Rare | Common in severe |
| Conjunctivitis | +/- | No | Yes | No |
| Neurologic | Rare but possible | Rare | Congenital Zika syndrome | Yes (encephalopathy) |
| IgM ELISA | Yes | Yes | Yes | Yes |
| Vector | Aedes | Aedes | Aedes | Aedes, Haemagogus |
| Special risk | Chronic arthritis | Shock, bleeding | Fetal malformations | Hepatic necrosis, death |
5. ⚠️ Severity Grading for Chikungunya
| Grade | Description |
| Mild | Fever, arthralgia manageable, no complications |
| Moderate | Dehydration, moderate pain, needs supportive care |
| Severe | Neurologic signs, hemorrhage, organ dysfunction, pregnant with complications |
🏥 Severe cases = Admit + consult Internal Medicine or Infectious Disease
6. 📅 Follow-up and When to Consult
🗓️ Follow-up
- 7–10 days post-acute phase to evaluate resolution
- At 3 weeks if joint pain persists → screen for post-viral arthritis
- Monitor for secondary infection or Dengue co-infection
🧑⚕️ Consult Internal Medicine / ID if:
- Severe arthritis >2–4 weeks (may need steroids)
- Neurologic symptoms
- Suspected coinfection (Dengue, Zika, Malaria)
- Chronic comorbidities (diabetes, CKD, immunosuppressed)
- Pregnant patient with systemic involvement
7. 🩺 Management Summary
🧊 A. Acute Phase (Day 1–10)
| Treatment | Dosage/Details |
| Paracetamol | 500–1000 mg PO q6h (max 4 g/day) |
| Hydration | Oral/IV fluids (based on clinical status) |
| ❌ Avoid NSAIDs initially | Until Dengue is ruled out |
| Antihistamine (rash) | Chlorpheniramine 4 mg tid |
🧩 B. Persistent/Post-viral Arthritis
| Step | Treatment |
| 1️⃣ | NSAIDs: Ibuprofen 400 mg tid OR Naproxen 250–500 mg bid |
| 2️⃣ | If no response → Prednisolone 5–10 mg/day PO x 5–10 days, taper |
| 🔁 | Refer to a rheumatologist if symptoms > 6 weeks |
🚨 C. Severe Case / Hospitalization (IPD)
- Admit, monitor vitals, IV fluids
- Rule out sepsis, dengue shock
- Pain control: IV Paracetamol ± Tramadol
- Specialist referral
🗃️ Prescribing Example for Outpatient (RDU-compliant)
- Paracetamol (500 mg) 1 tab q6h PO PRN for fever/pain
- ORS sachet 1 packet in 1L water q2h
- Chlorpheniramine (4 mg) 1 tab PO tid for rash
- Ibuprofen (400 mg) 1 tab PO tid after meals (ONLY if dengue ruled out)
📌 Take-Home Clinical Pearls
- Suspect Chikungunya in patients with acute fever + disabling joint pain
- Do not use NSAIDs until dengue is excluded
- Watch for post-viral arthritis
- Pregnant and elderly = high-risk → consult early
- Follow-up arthritis beyond 2 weeks → rheumatology
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