Once you understand how people pass syphilis to one another, you can figure out whether you're at risk. The disease is transferred from one person to another through contact with a syphilis sore. These sores may appear externally on the penis and outer vaginal area, or internally in the vaginal canal, anus, and rectum. They may also be present on the lips and inside the mouth.  If you've had vaginal, anal, or oral sex with someone infected with the disease, you are at risk of contracting syphilis. However, you need to come into direct contact with an infected lesion. Syphilis cannot be spread by shared eating utensils, toilet seats, doorknobs, hot tubs or swimming pools. Men who have sex with men (MSM) are significantly more likely to contract syphilis, with 75% of reported new syphilis cases in 2013. It's especially important to use safer sex practices if you are a man who has sex with men. The early stages of the disease do not have significant noticeable symptoms, and many people don't even know that they have syphilis. Even if carriers do notice sores and symptoms, they may not recognize them as an STD, and may leave them untreated for long periods of time. Because the minor sores can progress gradually from 1-20 years after the initial infection, carriers may unknowingly pass the disease on to others. Syphilis has 3 stages: primary, secondary, and tertiary/late stage. The primary stage usually begins about 3 weeks after the first exposure to a syphilis sore. However, symptoms might begin to appear anywhere between 10 and 90 days after exposure.  The primary stage of syphilis most often begins with the appearance of a painless sore called a “chancre,” which is small, hard, circular, and painless. Although there is usually just one sore, there may be more. The sore appears where the disease entered the body. Common infection sites include the mouth, genitals, and anus.  The sore will heal on its own in 4 to 8 weeks, and won't leave a scar. However, this does not mean that the syphilis is gone. Without...

How would you rephrase that briefly using Vietnamese?
Tìm hiểu con đường lây bệnh. Nên nhớ nhiều người hoàn toàn không hay biết dù đã mang vi khuẩn giang mai nhiều năm. Nhận biết triệu chứng trong giai đoạn 1. Phân biệt sự khác nhau giữa giai đoạn 1 và 2. Học cách phân biệt triệu chứng của giai đoạn tiềm ẩn và giai đoạn 3. Cảnh giác với triệu chứng giang mai ở trẻ sơ sinh.