Hi, I currently take Tysabri and have been dealing with bronchitis for over 2 weeks. My symptoms are getting worse instead of better ( constant coughing, lots of mucus, slight chills) , and I did go to Urgent Care last weekend. They told me to wait until I d had it for 3 weeks before I went back to my doctor, but I don t know if they even knew what Tysabri is. Does the medication make it harder for my body to fight this off on its own?