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Common Sexually Transmitted Infections (STIs)

Sexually transmitted infections (STIs), also known as sexually transmitted diseases (STDs), are very common and affect people of all ages, backgrounds, and from all walks of life.

Young people up to the age of 25 have the highest rates of STIs.

There are many different kinds of STIs.

Many STIs have no symptoms so you won’t know if you have an STI unless you have a test.

More than half of us will contract an STI at some point in our lives. 

In New Zealand, some of the most common STIs are:

How are STIs spread?

STIs are usually spread through sex—vaginal, oral or anal.

STIs can be spread through any type of sex: from a male to a female, a female to a male, a male to another male or a female to another female.

Some STIs can be spread through any contact between the penis, vagina, mouth or anus—even if there is no penetration. For example, genital herpes is transmitted through direct skin-to-skin contact, and can be transmitted even if there is no penetration.

Some STIs can be spread in other ways also. For example, HIV and Hepatitis B are spread through sharing needles for injecting drugs or medicines.