Hello, The vaccine for TB is Bacillus Calmette-Guérin (BCG) which is offered in alot of European countries. Once you have this vaccine you will always show up positive on your PPD. With you being from Croatia you may have recieved it which also may be why you are showing positive. The shot leaves a circular scar on your arm. I am from England and had the vaccination when I was young. Like everyone has posted, to attend nursing school and work in the field all I needed was a clear chest x-ray. Although, when I joined the military, prior to nursing, I didn't have an option but to take 6 mos of INH, even though I told them I had the vaccine, which has left me with mild tremors in my hands