p356

Figure 11.1 How STIs Spread Most STIs are spread by viruses or bacteria carried in certain body fluids. Figure 11-1 p358

Table 11-1a p359

Table 11-1b p359

Figure 11.2 Continuum of Risk for Sexual Relationships and Behaviors STI risks increase as relationships become less familiar and exclusive and as sexual activities become unprotected and receptive. Figure 11-2 p361

Abstain, Be faithful, or use Condoms. Following the ABCs of safer sex doesn’t mean you can’t have an intimate, loving relationship. p362

Human papillomavirus, which causes genital warts, is the most common viral STI. p365

Human papillomavirus, which causes genital warts, is the most common viral STI. p365

(a) Herpes simplex virus (HSV-1) as a mouth sore; (b) Herpes simplex virus (HSV-2) as a genital sore. p367

(a) Herpes simplex virus (HSV-1) as a mouth sore; (b) Herpes simplex virus (HSV-2) as a genital sore. p367

A baby exposed to chlamydial infection in the birth canal during delivery may develop an eye infection. Symptoms include a bloody discharge and swollen eyelids. p368

A cloudy discharge is symptomatic of gonorrhea. p370

A pubic louse, or “crab.” p372

Electron micrograph of a white blood cell being attacked by HIV (light blue particles), the virus that causes AIDS. p376