primary immunodeficiency syndrome
"I have only been on Hizentra one month so imagine it has not had time to work.  Within that month I have had 2 sinus infections (dealing with one now and feel awful).  I would like to know how long it took for people to start feeling better.  One doc says 5 infusions, and another says much longer.  However, I have had more energy in between the infections.  Your comments have been helpful."