No, but due to the nature of mice to cuddle up when asleep, the other mouse will get sick as well.
Possibly, yes. They occasionally canniblize.
If a laboratory mouse is sick, they may be lethargic or refuse to eat. They may also have diarrhea or discharge from their eyes and nose.
It is not obligatory if the mouse was not infected.
You shouldn't feed pizza to a mouse, it has a lot of fat in it and it can make it sick.
No he/she mite get sick
gross but yes
Yes.
Yes.
rock it in the grill
yes
no it just needs to drink more