At which stage does syphilis become noninfectious?

Question

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Syphilis,a bacterial infection caused by Treponema pallidum,is transmitted through sexual contact or from mother to child.There are four stages of syphilis.Lesions (chancres)appear in the primary stage;the second stage is characterized by a skin rash with low-grade fever,fatigue,headache,sore throat,and lymph node enlargement.If untreated,syphilis becomes latent,and approximately one-third of clients who have secondary-stage disease develop tertiary syphilis,a chronic disabling condition.Neurosyphilis is the final stage.Antibiotics are used in the medical treatment of syphilis.

At Which Stage Does Syphilis Become Noninfectious