I was diagonised with syphillis 2 months ago..three months ago i got tested and titration was 1:8 on repeated test it came negetive.. one months ago when the sore appeared i got tested again and titration came as 1:32. I got three shots of peniciilin for three consecutive weeks . My last shot was 2 weeks ago. Now when i got tested again the titration went upto 1:64. how ? why? please help