Thanks for query.
You are taking remicade infusion for crohn's disease which is a immunosuppressive drug
which can cause pulmonary tuberculosis
. It can reactivate tuberculosis. As your upper respiratory tract
infection is not getting rid offf and you are taking an immunosuppressive drug so we have to exclude tuberculosis.
So get a x-ray chest (PA view) done along with a sputum examination for acid-fast bacilli smear for 2 days. Then you consult a pulmonologist
and take his opinion.