Sewage sampling can look for a specific germ, and has been used to track Covid and its variants. We aren't realistically yet at a tech level where we DNA seque

Sewage sampling can look for a specific germ, and has been used to track Covid and its variants. We aren't realistically yet at a tech level where we DNA sequence everyone's minor sniffle just in case it's something new. But not too terribly far off it. There evidently already are mechanisms in place to respond to alerts of new notable breakout diseases by DNA sequencing them, that happened to Covid very early.