The NP told me that those who come back for a second infusion tell her how they have reacted to the drug. I asked her if they follow up with the patients after infusions, and they do not. Once they leave the infusion center, they don't really know what happens to them, unless they do come back for another infusion. In my review of the infusion center, I will suggest that they make follow up call with all patients who have the infusion to see how they react. Because I agree with you, they do not know unless the patients tell them at their next infusion.