Fig. 1
From: Prolonged persistence of IgM against dengue virus detected by commonly used commercial assays
Kinetic scatterplots and regression analyses of log-transformed mean optical density values at 450 nm (OD450) and mean index values (IV) for anti-DENV IgM measured by the SD ELISA and the Focus ELISA, respectively, over time in 17 people who were anti-DENV IgM positive initially defined by the SD ELISA and reported being diagnosed with DENV infection in 2015. a Results of the SD ELISA. The dashed line represents the mean cut-off OD value among different plates. (R-square: 0.5176; slope coefficient: − 0.0037, p < 0.0001). b Result of the Focus ELISA. The dashed line represents the cut-off index value. (R-square: 0.5057; slope coefficient: − 0.0044, p < 0.0001)