A 34-year-old man from Bangalore returns from a trip to Kerala 8 days ago. He presents with a 3-day history of fever (38.5°C), severe polyarthralgia affecting the wrists, knees, and small joints of the hands, and a maculopapular rash on his trunk and limbs. He reports that the joint pain is so severe he cannot perform his daily activities. Platelet count is 145,000/μL (normal), and liver enzymes are normal. Serum IgM antibodies against chikungunya virus are positive. Which of the following is the most appropriate next step in management?

Explanation

## Management of Chikungunya Fever ### Clinical Diagnosis: Chikungunya **Key Point:** The hallmark of chikungunya is **incapacitating polyarthralgia** affecting small joints (wrists, ankles, fingers, toes) and large joints (knees, shoulders), often persisting for weeks to months. Positive IgM antibodies confirm acute infection. ### Why This Is Chikungunya, Not Dengue | Feature | Chikungunya | Dengue | | --- | --- | --- | | **Arthralgia severity** | Severe, incapacitating | Mild myalgia | | **Joint distribution** | Small joints (wrists, fingers) + large joints | Generalized myalgia | | **Rash character** | Maculopapular | Petechial/hemorrhagic | | **Thrombocytopenia** | Absent or mild | Marked (often <100,000/μL) | | **Retro-orbital pain** | Absent | Characteristic | | **Hemorrhagic signs** | None | Positive tourniquet test, petechiae | | **Chronic sequelae** | Arthralgia (months–years) | Rare | ### Pathophysiology of Chikungunya Arthralgia 1. **Acute phase (days 1–7):** Viral replication in joints and synovial tissue 2. **Immune phase (weeks–months):** Persistent synovitis and inflammatory response 3. **Chronic phase:** Some patients develop post-chikungunya arthralgia syndrome (PCAS) lasting 3–12 months or longer **High-Yield:** Chikungunya virus has a predilection for joints and synovial tissue, unlike dengue which targets endothelial cells. ### Management Strategy **Clinical Pearl:** There is **no antiviral therapy** for chikungunya. Management is entirely supportive. 1. **Analgesics:** NSAIDs (e.g., naproxen, ibuprofen) are first-line for joint pain and fever 2. **Physiotherapy:** Early mobilization and gentle exercises to prevent joint stiffness 3. **Patient counseling:** Warn about chronic arthralgia; reassure that it is self-limited 4. **Rest and hydration:** Adequate fluids and rest during acute phase 5. **Avoid:** Corticosteroids are not routinely indicated unless severe inflammatory response **Mnemonic: CHIK-MANAGE** - **C**ounseling on chronic arthralgia - **H**ydration and rest - **I**NSAIDs for pain - **K**eep moving (physiotherapy) - **M**onitoring for secondary infections - **A**void antivirals (none effective) - **N**o corticosteroids (unless severe) - **A**nalgesics (paracetamol or NSAIDs) - **G**eneral supportive care - **E**ducation on prognosis ### Why Other Options Are Wrong - **IVIG:** No role in chikungunya; reserved for immunodeficiency or severe immune-mediated conditions - **Ribavirin:** No evidence of efficacy; chikungunya is self-limited - **Dengue vaccine:** Inappropriate; patient has chikungunya, not dengue; no chikungunya vaccine available in India [cite:Park 26e Ch 8; Harrison 21e Ch 197]