Hi Last year month of june o donate blood in blood bank but after few days i receive call from blood bank that my blood is showing vdrl positive and tpha 1.320 refer me skin department doc gave me penculin injection dose 1.2 weekly 3weeks but i hve no syphills Aftr 3month my vdrl positive and tpha is 1.64 After 6 month my vdrl constant postive and tpha is 1.640 but same i have no syphills This time doc recommend me doxycycline medice twice a day for one month after complete of medicene 2 month later i re test But this time my vdrl is negative I again test in many laboratory all shown negative m now confused is it possible vdrl came negative and should i test for tpha now or csf m confused please suggest me My age 24