Can the saliva of syphilis patients spread syphilis?

Yan 'an Sunshine urology expert said: Unless saliva contains Treponema pallidum, it is less likely to be infected with syphilis, which is mainly transmitted through sexual life, accounting for more than 95%. Treponema pallidum exists in a large number of damaged surfaces of skin and mucosa, as well as in saliva, milk, semen and urine. Untreated patients are the most contagious within one year of infection, and with the extension of the disease, the infectivity becomes less and less. People who have been sick for more than 4 years are not infected through sexual contact. Blood may also be the source of infection. If the blood donor is a latent syphilis patient, his blood may contain Treponema pallidum. Once transfused into the recipient, infection will occur. This kind of patients have no symptoms of primary syphilis, but directly have symptoms of secondary syphilis. Syphilis can also be transmitted through the fetus. Women with syphilis, without treatment, after pregnancy, Treponema pallidum in the mother can circulate to the fetus through the blood, so that the fetus is infected with syphilis.