An infectious disease(传染病) is a disease that can be passed from one person to another. Sexually Transmitted diseases are a category of diseases that are spread via sexual activities, such as vaginal intercourse, oral sex(口交), or anal sex(肛交)
An infectious disease（传染病） is a disease that can be passed from one person to another. Sexually Transmitted diseases are a category of diseases that are spread via sexual activities, such as vaginal intercourse, oral sex (口交), or anal sex（肛交）
Sexually transmitted diseases are caused by one of 3 types of organisms 1. Parasites Parasites are very small animals that get nourishment from the person they infect The infected person is called host(宿主) Pubic lice. also called crabs. are an example of sexually t ransmitted parasites
Sexually transmitted diseases are caused by one of 3 types of organisms. 1. Parasites. Parasites are very small animals that get nourishment from the person they infect. The infected person is called host(宿主). Pubic lice, also called crabs, are an example of sexually transmitted parasites
2. Bacteria Bacteria are organisms made of one cell. They cling together to feed from the body of their host gonorrhea (淋病, syphilis(梅毒), Chlamydia(衣原体),and Chancroid(软下疳) are examples of sexually transmitted bacteria
2. Bacteria. Bacteria are organisms made of one cell. They cling together to feed from the body of their host. Gonorrhea (淋病), syphilis (梅毒), Chlamydia (衣原体), and Chancroid (软下疳) are examples of sexually transmitted bacteria
3. Virus Virus are complex molecules that can multiply(J1) when they invade the cell of their host HIV, herpes and hepatitis are sexually transmitted viruses
3. Virus. Virus are complex molecules that can multiply (繁殖) when they invade the cell of their host. HIV, herpes, and hepatitis are sexually transmitted viruses
Usually infections that are caused by a virus cannot be cured, but in some cases they can be controlled
Usually infections that are caused by a virus cannot be cured, but in some cases they can be controlled