Tam hun in answer to your question... yes rubella immunity can run low, mine was 74 two years ago and in that time it dropped to 25. It is suppose to be > than 10, but apparently a nurse in my health service was supposedly immune, but low like myself and she got german measles and the baby she was carrying had some deffects when it was born. Being in the environment i work in, i need to be very careful, not only for myself but for any of my patients. My GP said that it was unusual for it to drop so rapidly in such a short space of time, but hey I am a freak!!! Usually they run bloods prior to IVF and this is one thing they check. You should probably go and get yourself checked out for your immunity status. My first and only shot like yourself, was when i was in year 7!!!

Take care leis x