Tested Syphilis positive with titre 1:32 in March 2018. HIV, Chlamydia, Gonorrhoea, Hep C were negative in March 2018, July 2018, November 2018 and February 2019.
Since the last syphilis test was in September 2017, the doctor diagnosed this syphilis as early latent. Syphilis was detected serologically but the doctor did not complete physical exam. I had a sore right on my anus. I was treated with 1 injection of Penicillin on 27 March 2018. Titres dropped to 1:8 in November 2018 test. The doctor declared that the treatment was successful due to 4 fold decrease in titre.
However, my last test in February 2019 the titre is 1:16. This is a 2 fold increase. Does this mean I am reinfected or does this mean my last treatment was unsuccessful? I haven't received a phone call from the doctor's office as yet but I believe the doctor will not be concerned as there should be a 4 fold increase. I believe he will wait it out until May 2019 when my next tests are scheduled.
Please help me calm down with your expert opinion. Why is there an increase in titre whereas it should be either the same or a decrease?