My son has been on remicade for 3 three years now and has been fairly good throughout. He even had a roommate, which whom he shared a bathroom, diagnosed with mono and my son was fine.
Until just this past year, my son had no more/no less colds/infections than anyone else. And, when he did, they went away just as if he wasn't on remicade. We used typical treatments... but, no nsaids with crohns! Tylenol only.
I do keep my son's GI informed of any and all medical issues. I just send his office an email and let him know what's wrong, what is being done and ask if he has any concerns with either the problem or the treatment. A couple of times, his GI has asked for his own follow-up/tests but, most of the time, just asks that I keep him informed of any changes.
But, I do think it's important to keep your GI in the loop; since he was aware of any/all issues, at the latest apptmt, GI mentioned that in the last 6-12 months, it seemed my son has had a few infections (skin rash, bronchitis, etc.) and decided to test his remi levels at an upcoming infusion.
I know this is getting a bit off topic but since this is new to you :ghug:... have a conversation with your GI about what he wants/needs to know. I was never sure when I should be calling the GI or just family doctor... so I just asked the GI the question. He said he'd like to be kept informed of most things and, if/when necessary, he'd let me know if he had any concerns or questions. It's worked really well and relieves some of my concerns knowing he is also aware of any issues. In addition to things like bronchitis, etc., I also let him know of injuries, etc because these can also affect lab results... Not sure if this would work with you but, if my son needs to go to ER for anything (ie injuries, non crohns pains, etc.), we always go to the same hospital as his GI - this way, GI has access to all records and, in the past, has facilitated referrals from GI to other specialists.