RESPECTED DOCTOR,
4 year before i was diagnose syphilis disease during blood donation without any symtoms,i went to lab and get VDRL screening test which was positive at the same time i done my TPHA test with titer 1:320,my doctor suggest me Doxycycline for 24 days.after treatment i repeat my test but vdrl and tpha still positive my other test value is given below
CBC NORMAL
ESR 5 NORMAL
ECG NORMAL
LFT NOMAL
creatinine NORMAL
PLEASE ANSWER ME WHY VDRL AND TPHA STILL POSITVE.