The likelihood of being infected with syphilis by sharing a washing machine with someone who has syphilis is extremely small. In most cases, the syphilis spirochete is difficult to survive after leaving the body, and boiling, drying, sunlight, soap and water, and general disinfection can quickly kill it. Only a very small number of people may be infected through kissing, shaking hands, breastfeeding, or touching clothing or utensils with syphilis spirochetes. Patients with syphilis are only infectious in the early stages, and untreated patients are strongly infectious for 1-2 years after infection. As the duration of the disease increases, the infection becomes less and less contagious, and patients who have been infected for more than four years are basically not contagious. The main ways of transmission of syphilis are sexual contact transmission, mother-to-child transmission, and blood transmission, with sexual contact transmission being the most common, accounting for more than 95% of the total number of infections.