Syphilis seven weeks negative basically will not turn positive. Syphilis is caused by syphilis spirochete infection of sexually transmitted diseases, the general human body infected with syphilis spirochete to produce antibodies need a period of time, that is, the incubation period, syphilis incubation period of an average of 2 to 4 weeks or so, most of the people after 4 weeks of the examination for the negative basically exclude the possibility of syphilis infection, so syphilis seven weeks of negative basically exclude the infection; but a very small number of people can be up to three months of incubation, so it is recommended that the incubation period in the three month The test can be repeated in about three months. If the patient has high-risk behavior or syphilis-related symptoms, it is recommended to go to the regular hospital in time to improve the relevant examination, under the guidance of the doctor to clarify the diagnosis, so as not to delay the condition.