Diagnosis and Tests for Chikungunya

Chikungunya overlaps heavily with dengue - same mosquito, same season, same opening fever. Testing separates them, and timing decides which test works.

The tests, by day of illness

• Days 1-5 (early): RT-PCR on blood detects the virus directly - the definitive early test, available at larger labs and government hospitals
• Day 5 onward: chikungunya IgM antibodies - the standard test for the second week and beyond; stays positive for weeks to months
• IgG antibodies: rise later and persist for years - useful to confirm past infection, including a retrospective answer for chronic joint pain

What else the doctor orders

• Dengue NS1 antigen and IgM: to exclude dengue - the most important parallel test, since dengue needs different watching (platelets, leakage, bleeding)
• Complete blood count: chikungunya typically lowers white cells with platelets near normal; dengue sinks platelets
• Malaria smear or card test where fevers overlap
• In chronic joint pain: inflammatory markers (ESR/CRP), rheumatoid factor and anti-CCP to separate post-chikungunya arthritis from rheumatoid arthritis

Where to test in India

Government district hospitals and NIV-linked labs test during outbreaks; private labs (the big chains) offer chikungunya IgM and PCR panels, often bundled with dengue. Cost is modest; the value is large - a label changes both treatment and vigilance.

Who should get tested

• Anyone with abrupt fever + severe joint pain during an outbreak
• Any "viral fever" with joint pain where dengue is being considered
• Months of unexplained joint pain following a suspected viral fever - the late IgG answer

One-line summary

RT-PCR in the first 5 days, IgM after, dengue excluded alongside every time - and for chronic joint pain after a fever, the antibody test closes the loop.