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Sexually Transmitted Diseases/Infections

Sexually Transmitted Diseases/Infections

Author: Aaron Mullally

This lesson will introduce the causes and effects of several sexually transmitted diseases.

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Video Images: Chlamydia image, Creative Commons:; Gonorrhea image, Public Domain:; Syphilis image 1, Public Domain:; Syphilis image 2, Public Domain:; Genital Herpes; Creative Commons: Genital Warts image, Creative Commons:; Hep B image, Public Domain:; Hep C replication image, Public Domain:; Trichomoniasis image, Creative Commons:

Source: Aaron M

Terms to Know

The most common STD in humans, Chlamydia is caused by a bacterium that infects the reproductive and urinary tracts. If left untreated it can cause pelvic inflammatory disease.

Genital Herpes

A viral infection that can cause sores to develop on the mouth or reproductive organs, genital herpes is an incurable disease.

Genital Warts

Caused by the human papilloma virus (HPV), genital warts appear on reproductive organs and the anus and can increase the chance of developing certain cancers.


Commonly referred to as the clap, gonorrhea is a bacterial infection that can cause painful urination and penile discharge in males and vaginal discharge in females.

Hepatitis B

A retroviral infection of the liver that is spread through sexual contact and is very curable in adults.

Pelvic Inflammatory Disease

Inflammation of the uterus, fallopian tubes/oviducts and/or ovaries that can lead to scarring and damage.


Caused by bacteria, syphilis initially presents as a rash or skin lesions and if left untreated can cause cardiovascular damage and insanity.


A protozoan parasite that commonly causes vaginitis in females.