Fig. 3.
Results of the hMPV genotype-specific RT-LAMP assay observed by daylight and UV light. (A) The results of the RT-LAMP assays visualized by daylight with a white precipitate of magnesium pyrophosphate. 1, 2, 5 and 6, positive for hMPV-A; 3 and 4, positive for hMPV-B; 7, negative reaction; 8, negative control. (B) The positive results of the RT-LAMP assays with FDR visualized by naked eyes with faint yellowish green under daylight and with strong green fluorescence under UV light.