Chlamydia infection is asymptomatic in as many as 70% of cases in women and 50% of cases in men.1 However, only just over half of men and three quarters of women are aware of this2 and may therefore assume that because they have no symptoms they cannot be infected.

Moreover, awareness of Chlamydia, and that it is an STI declines with age, especially among men.2

*Data were not collected from women over 50

An additional risk is posed by oral sex. Most sexual infections can be transferred by unprotected oral sex. One in four people under 21 think they cannot catch an infection from oral sex, and are completely unaware that their mouth can become infected even if their genitals aren’t. They are also unaware that as a carrier of the infection, they can pass it on by oral sex.