Human Growth and Development / Unit 9 HGD 1230 short lesson, about 20 seconds
STIs and STDs
Captions available
The idea
A sexually transmitted infection is an infection passed through sexual contact by a virus, bacterium, fungus or parasite; it becomes a sexually transmitted disease when it produces disease.
In practice
HPV and chlamydia, often carried without symptoms.
Where people slip
Because many infections cause no symptoms, a person can transmit an infection without knowing it.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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