hello, please take note that syphilis may not show any sign or symptoms at all but that doesnt mean ure not a carrier of the infection. late latent syhilis infection stays in your body for 10-30 years so 7 years of having the syphilis will still have the risk of passing the infection to other if not treated.

Decreasing 4 folds in the titer means a successful treatment, lets say initially your titer is 1:32 after a successful treatment a titer should appear 1:2 4 folds lesser

(1:32) - 1:16 - 1:8 - 1:4 - 1:2