Syphilis patients have lived in the house is possible to live, syphilis infectious pathway is mainly sexual contact infection, and its secondary venomous spirochetes are present in large quantities in the surface of the skin mucous membrane damage, but also in saliva, milk, semen, urine. These secretions and excretions are also infectious. Generally within one year after the disease is most infectious. More than 4 years is mostly not infectious, after treatment titer is less than 1:4 basically also not infectious. If you are also afraid of AIDS, you can choose Ai Wei on Tmall to check yourself. The first stage of syphilis, mainly in the pubic area appeared a hard knot surface is an ulcer surface, this is the hard chancre.