Syphilis is a contagious STD that is also highly infectious and can be transmitted in many ways. Syphilis is one of the most common of the male and female sexually transmitted diseases, and is highly contagious and primarily sexually transmitted. However, the infectiousness of syphilis through sexual transmission decreases over time. Usually, if a person with syphilis has untreated disease, the likelihood of infection is highest and most contagious within one year, and then decreases to almost non-contagious. Also, syphilis can be transmitted through contact with items infected with the virus, such as an uninfected person who comes into contact with dishes or cigarettes used by an infected person. Placental transmission is also a route. A woman infected with syphilis can transmit the virus through the placenta to her fetus during pregnancy, resulting in a baby born with congenital syphilis. In addition, blood can be transmitted. It can be transmitted by contact with the blood of a syphilitic patient at the site of a wound or mucous membrane rupture or by importing syphilitic-infected blood or by sharing needles with the patient. To prevent syphilis, you should avoid unsafe sex, be hygienic, do not touch the patient’s utensils, and do not use blood or needles of unknown or unclean origin. Syphilis is contagious and highly infectious, and there are many ways, such as sexual intercourse and blood and contact transmission, so you should be careful to prevent it in general.