No Sajid,
i didn't decrease my son's desferal, I think that IP6 and desferal serve 2 different purposes.  Desferal more aggressively removes iron from the body, IP6 protects against iron damage, and to a smaller degree chelates iron as well.   At this point I think that we need both.  
I hope that you can begin taking the IP6 again, as Andy said it can not possibly give you an infection - unless if it was contaminated or something.  Why not order more fresh IP6 and give it a go again?
Sharmin