The LINEAR Dengue-CHIK cassette is a lateral flow immunoassay for the simultaneous detection and differentiation of IgG anti–dengue virus, IgM anti-dengue virus, and IgM anti-chikungunya virus (CHIK) in human serum, plasma, or whole blood. It is intended to be used by professionals as a screening test and provides a preliminary test result to aid in the diagnosis of infection with dengue and chikungunya viruses.