Device for the lateral flow immunoassay. (a) Schematic of the lateral flow immunoassay. SP: sample pad, CP: conjugate pad, NC: nitrocellulose membrane, T: test line, C: control line, AP: absorbent pad. (b) Detection scheme of dengue detection based on nanoparticle aggregation. (c) The respective dimensions of the immunoassay represented in millimeters (mm).