Figure 1.
Time course of chikungunya virus (CHIKV) viremia and immune response. Limit of detection (LOD) of real-time reverse transcription–polymerase chain reaction (RT-PCR) assay is approximately 100 plaque-forming units (PFU)/mL (approximately 1 RNA transcript/reaction); the LOD of the immunoglobulin M (IgM) antibody capture enzyme-linked immunosorbent assay (ELISA) positive-to-negative ratio (P/N) is >2. Abbreviations: Ab, antibody; IgG, immunoglobulin G.