you are contageous for up to 48 hours after last motion, but obviously as time goes on the chances of transmitting are dimished. it really comes down to their personal hygiene. did they wash their hands correctly ? Dishes and surfaces?

you can be contagous before the runs the start as the bug may have been in their systems, but it depends what the bug strain the bug is.

Just make sure you guys follow good hygiene practice at home meticilously and spray some air spray such as glen-20 around and wipe over all surfaces with anti-batceria sprays. also open the windows and air the house out.

you might not be able to stop being infected, but hopefully your immune systems are strong enough to fight it off, and if you can kill some of the bugs in the meantime, it will help as well!!