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Causes of STIs

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Sexually transmitted infections are caused by one of 3 types of organisms.

Parasites: Parasites are very small animals that get nourishment from that the person they infect. The infected person is called the host. Pubic lice, also called crabs, are an example of sexually transmitted parasites.

Bacteria: Bacteria are organism made of one cell. They cling together to feed from the body of their host. Gonorrhea, syphilis, chlamydia, and chancroid are examples of sexually transmitted bacteria.

Viruses: Viruses are complex molecules that can multiply when they invade that cells of their host. HIV, herpes, and hepatitis are examples of sexually transmitted viruses.

Usually infections that are caused by a virus cannot be cured, but in some causes they can be controlled.

Parasitic infections can be treated with medications or over–the–counter drugs. Bacterial infections can be treated with antibiotics
  • You have unprotected sex
  • A Condom tears during intercourse
  • Your sexual partner has an STI
  • Your partner is engaging in sex with other people




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