yes
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.
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
Yes.
gross but yes
rock it in the grill
Yes.
Signs that a laboratory mouse may be sick include lethargy, hunched posture, reduced appetite, weight loss, respiratory distress, and abnormal behavior. Regular health monitoring and observations of physical symptoms can help identify illness in mice. Consulting a veterinarian for a thorough examination and diagnosis is recommended if a mouse is suspected to be sick.
yes
no it just needs to drink more