I has syphilis 3 year ago and was treated with 2 extencyclin shots.
last year my VDRL was 1/2 and TPHA 640. This year VDRL is 1/2 but TPHA is 1280.
I had no sex at for the last 2 years.
What could be the problem ? Problem the TPHA test or bad treatment ?
There is no difference in those THPA results, as that is only a 2-fold increase in titer. If there is reinfection or reactivation, we expect a 4-fold or greater increase in the titer. The VDRL or TPHA can remain positive for months to years after successful treatment.