My husband's GI told us that folks on remicade just need to be careful about live or attenuated vaccines. The seasonal and swine flu shot are safe, because they are not live or attenuated vaccines. So, go for it. Get the seasonal and swine flu shot. I know that my husband will be.
My husband makes it a point to wash his hands frequently, and carries alcohol-based hand sanitizers for when he cannot wash his hands. Other than that, he tries to keep his hands away from his nose, eyes, and mouth. Also, if there are sick folks in adjoining cubes in the office, he just works from home, just to be on the safe side. Also, he never shares his food with anyone. I also clean all surfaces in the house with a bleach based cleaner, since he's had problems with c-diff, but also to help keep us all healthy. When traveling, we carry saline solution, and also apply a little vaseline to the inside of the nose with a clean q-tip, to keep the nasal passages moist, so that germs don't get through easily.
With kids, it's much harder, since kids are very tactile . . . I'd suggest having your kids wash up immediately upon coming home, and laundering their school clothes with each wear.
Hope this is some help. Don't be scared of the remicade, it really can help. My husband has been on it since April 08, with no real increase in infections.
Husband with Crohn's
Diagnosed March 2003 Ulcerative Proctitis
Diagnosed March 2008 Crohn's & C-diff, hospitalized 45 days
Canasa, Lialda, Remicade, VSL#3, Florastor
In Remission since June 2008
Stopped vancomycin for c-diff Jan 1 2009
C-diff free, until Sep 2, 2009
Fighting c-diff, I guess for life