This is probably not an answer that you would expect, but yes I was tested several times in the past.
The way the story goes is that I had an ROTC scholarship to go to college. I got all my shots and vaccinations during the summer. Then in September, I had to take my physical. I showed positive on the serology battery. So I had to give another blood sample. It was positive, but less so. So I did it again. It was still positive, but even less so. Finally, they figured out that my tetnus shot was giving a false positive for sphyllis.
The thing that made it hard to explain was that I was still a virgin at that point and my mother was a nurse. So she knew what they were testing for.
Of course, that was back in 1965.