I'm confused, K.. Paget's concerns the bones. The body doesn't rebuild bone. It is not contagious. the Web site said that it could eventually affect internal organs but does not mention skin or breast infections.
I think that they can take a smear when the infection is active to determine it's cause, whether virus or bacterial. Not all skin infections are contagious. I don't know if ingesting a virus or bacteria could lead to illness. I recommend that you talk with your doctor again to learn more about what is going on in your body and if you could infect your baby.
April 17, 2008 addendum
After reading Jennifer's post I looked up Paget's and breast and learned that it is related to cancer of the breast. Cancer is not contagious. I've had surgery for cancer in my lungs. Cancer is not contagious!
Your condition is different than I thought. However, there is hope. I had a segment of my lung removed and I'm cancer free after 5 years. Hopefully you have found the cancer early enough that you too will have success in ridding your breast of the cancer tissue. My prayers are with you as you go down this path. For me it was weeks before I had surgery and truly knew what was happening with me. It's the waiting to know that was most difficult for me. After they did a biopsy the doctor could give me more information and I was encouraged.
Since my tumor was in the lung they took a section of the tumor using a laryngoscope while I had twilight anesthesia. I didn't remember anything afterwards and I had no pain or discomfort. I don't know where they will take the tissue from in your case. I have a friend who had a biopsy of breast tissue years ago and she has a small scar on her breast. In my experience it's not the biopsy that's an issue. It's the waiting to find out the results.
Be assured that if you have cancer your baby is not at risk from breast feeding. And know that cancer is no longer a death sentence. I hope that your doctor will keep you informed as you proceed with the diagnostic tests. My doctors kept me informed and I was able to wait with arelative lack of fear the couple of months it took to decide about having surgery.
I wish for you the best care and a positive prognosis.