FIG. 3.

(a) The pathogen extraction can be approached by using a drop screen technology.^55,56 By encapsulating the single pathogens within the droplets, enzymatic reactions were processed. The fluorescence intensities were automatically evaluated for sorting. (b) The fluorescence signals could be converted to be electrical signals.⁵⁶ The threshold signals could be automatically counted for droplet sorting. Reproduced with permission from Ng et al., Anal. Chem. 91, 1277 (2019). Copyright 2019 American Chemical Society.⁵⁶