This spray includes all DNA arrays such as cas12a, cas13a, reportoer and guide-RNA and when spray this in the surface, it changes its colors
Introducing all the reagents for coronavirus detections in bacteria (cas12a, cas 13a, reporters, etc) and use these bacteria for coronavirus detections. If this practically works, it leads anyone in a small community to grow their bacteria for testing without any resource limitation.
It allows self-monitoring over the long-period (something similar to the glucose sensor) that could both detect the level of your antibodies and the concentration of the virus.