Syphilis titer 1:2 can only indicate that syphilis is basically non-infectious, but not necessarily neurosyphilis, neurosyphilis diagnosis is mainly based on the cerebrospinal fluid syphilis spirochete antibody test. Neurologic syphilis: Neurologic syphilis belongs to the third stage of syphilis, that is, the late stage of syphilis, refers to the infection of syphilis for more than 3 months, the syphilis virus invades the central nervous system, causing headache, vomiting, dementia, mental anomalies, etc., and its diagnosis usually relies on the symptoms of the central nervous system, and the confirmation of the diagnosis is mainly required for cerebrospinal fluid examination. Syphilis titer refers to the level of non-specific syphilis antibodies in the blood, which is used to determine the infectiousness of syphilis and the effectiveness of treatment. 1:2 titer is a low level of syphilis titer, which is generally not infectious. Syphilis patients need to be in a professional and formal medical institutions, follow the doctor’s instructions for standardized diagnosis and treatment, do not blindly use medication, so as not to delay the condition.