Hi
I had my sct in 2016 and the first 2 years was cold after cold which always developed into a chest infection, always requiring antibiotics and sometimes requiring steroids as well. As we had to wear masks during Covid, I found I had no infections, however since removing masks (recently) I have had one infection after another. My Ig’s are normal. I think we just have to be careful. For me I had 50 years of immunity which was wiped out after sct, the only remaining immunity I had was strangely to tetanus. It takes time to build back up again, I believe. Sue