After syphilis cure still can relapse

Syphilis completely cured after the basic will not relapse, if again show symptoms, may be re-infected with the following characteristics. First, the past has a conclusive early syphilis diagnosis, and received regular anti-syphilitic treatment, to achieve clinical and serum cure. Second, the recurrence of hard chancre, and away from the last occurrence of the site. Third, hard chancre samples found Treponema pallidum. Fourth, syphilis serological examination from negative to positive.