Of course the obvious question, I already know the answer BUT....
How can anyone possibly know this things is safe long term if after a year they had no idea that it causes a false positive syphilis test. They are still “discovering” things about this shot, ergo they have no idea yet what it does long term.
I think it’s clear the stab can cause endocarditis—and this bulletin says it was previously known that endocarditis can lead to a false positive on this test.