Outline STI Part 1 Intro and Bacteria

Outline STI Part 1 Intro and Bacteria - Sexually...

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Unformatted text preview: Sexually Transmitted Infections More than 25 diseases (STIs) are spread primarily through sexual activity - anal, oral or vaginal sex • Effects not limited to reproductive organs • Do not always involve sexual activity, but most often do • Infectious agents enter body through mucous membrane which are warm moist surfaces of vagina, urethra, anus and mouth There is a sexually transmitted infection epidemic in this country • Each year in US approximately 19 million infected with one or more STI • Approximately half of all STIs in US occur among 15-25 year olds • 1 in 4 sexually active teenager (3 million) contracts one or more STI each year. Why is the incidence so high in 15- 25 age group? • more sexual activity at younger ages • more sexual partners • use of oral contraceptives results in less use of spermicides & condoms • no outward signs cause one to pass it along • guilt, embarrassment often leads to no treatment Causal agents • STIs or STDs are diseases that are spread through oral, anal or vaginal intercourse. • Some STD/STIs such as HIV and Hepatitis B can also be transmitted by sharing drug injection equipment. • Most STIs are caused by – single celled organism such as bacteria, protozoa, yeast (fungi) – or by viruses which are not living organisms • Will discuss each major STI according to causal agent Bacteria are very simple single celled organisms • Bacteria are everywhere - include harmless and not so harmless ones that live inside us • harmful ones that cause syphilis and gonorrhea around since ancient time • Three major STIs caused by bacteria: syphilis, gonorrhea, chlamydia • Can be cured by antibiotics, but cause serious complications if left untreated • Some casual agents of common vaginal infections are also bacteria Chlamydia • Most common STD in US – 3 to 5 million new cases each year • Caused by bacteria- Chlamydia trachomatis • Affects urinary tract and reproductive organs of men and women • In women, two general types of genital chlamydia infections – infections of lower reproductive track affecting the urethra or cervix causing inflammation – Or invasive infections of the upper reproductive tract, expressed as PID, Pelvic Inflammatory Disease Chlamydia...
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This note was uploaded on 10/19/2009 for the course BIO 30 taught by Professor Kahn during the Spring '09 term at UC Riverside.

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Outline STI Part 1 Intro and Bacteria - Sexually...

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