Hi!!! I also am/was a healthcare professional and I was on Avonex for 7 years. During that time I rarely was sick even though I had a lot of exposure to moderately sick people. It wasn't until I added Novantrone to the Avonex that my white counts dropped dramatically and I began to notice that I was more contagious. After my 6th Novantrone treatment, my counts didn't come back up after 3 months and we discontinued the Avonex and the Novantrone. My liver function tests and white counts were ok with just the Avonex for a very long time. Hope this helps you! May God Bless your decision!