Arbovirus Panel for Febrile Travelers
Order dengue and Zika virus NAATs on serum collected ≤7 days after symptom onset, followed by dengue and Zika IgM antibody testing on NAAT-negative specimens or serum collected >7 days after symptom onset; add chikungunya testing (PCR in first week, serology thereafter) when arthralgia is prominent or during known outbreaks. 1
Testing Algorithm Based on Timing
Within 7 Days of Symptom Onset
- Perform nucleic acid amplification tests (NAATs/PCR) for:
- Dengue virus (serum)
- Zika virus (serum and urine if pregnant)
- Chikungunya virus (serum) - particularly if severe arthralgia present
- NAATs are the preferred diagnostic method during the acute viremic phase 1
- Direct virus detection is most reliable in the first week of illness 2
After 7 Days of Symptom Onset
- Perform IgM antibody testing for:
- Dengue virus
- Zika virus
- Chikungunya virus
- Serology becomes the primary diagnostic tool from the second week onward 2
- If IgM is positive with negative NAAT, confirm with neutralizing antibody tests when clinically indicated, especially in all pregnant women 1
Special Considerations for Pregnant Women
For symptomatic pregnant women, collect both serum and urine specimens as soon as possible within 12 weeks of symptom onset for concurrent dengue and Zika virus NAATs AND IgM antibody testing (not sequential - do both simultaneously) 1. This differs from the nonpregnant approach because determining the specific timing of Zika infection is critical for pregnancy management.
Clinical Context Matters
Dengue-Specific Features
- Most common arboviral infection in travelers from Southeast Asia 2
- Monitor for warning signs of severe dengue around day 5 (rising hematocrit, plasma leakage, hemorrhage) 2
- Requires appropriate management to monitor and treat shock and hemorrhage 1
Chikungunya-Specific Features
- Characterized by severe and often long-lasting arthritis 2
- Consider especially when joint symptoms are prominent or persistent 3, 4
- Often occurs in epidemics 2
- Arthralgia may persist beyond acute phase, requiring escalation to corticosteroids if NSAIDs fail 3
Zika-Specific Features
- Incidence has decreased substantially in recent years 4
- Critical to diagnose in pregnant women due to fetal complications 1
- Women with laboratory evidence of possible Zika infection during pregnancy require evaluation and management for adverse outcomes 1
Common Pitfalls
Cross-reactivity is a major limitation of IgM antibody testing between dengue and Zika viruses due to their close relationship as flaviviruses 1. This is why neutralizing antibody confirmation is essential when IgM is positive but NAAT is negative, particularly in pregnant women where precise timing matters.
Consider epidemiologic data from the specific travel location - knowing which viruses are actively circulating helps interpret equivocal results 1. For example, the large chikungunya outbreak in the Caribbean starting in 2014 made chikungunya more likely in travelers from that region during that period 5, 6.
Additional Testing Considerations
While yellow fever and Japanese encephalitis are vaccine-preventable arboviruses 4, they should be considered in the differential for encephalitis/meningitis presentations rather than routine febrile illness panels, particularly if the patient was unvaccinated and traveled to endemic areas.
Exclude malaria concurrently, as it remains one of the most frequently diagnosed mosquito-borne infections in returning travelers 4.