Lecture_7_July_7_Bio_30

Lecture_7_July_7_Bio_30 - Chicken pox and genital herpes...

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Chicken pox and genital herpes are caused by closely related viruses Genital herpes stigmatized Chicken pox not so much Genital herpes = STI Only illnesses categorized by mode of transmission rather than type of source
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More than 25 diseases anal, oral or vaginal sex Effects not limited to reproductive organs Do not always involve sexual activity Infectious agents enter body through mucous membrane Warm moist surfaces of vagina, urethra, anus and mouth
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more sex more partners less spermicides & condoms no outward signs guilt, embarrassment Why is incidence of STIs so high in 15 to 25 year olds?
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Oral, anal or vaginal intercourse & “activity” Some STIs such as HIV and Hepatitis B can also be transmitted by sharing needles.
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Microbes (bacteria, virus, protozoa etc) spread through sexual contact used to be called “sexually transmitted diseases” (STDs) Several common STDs have no signs or symptoms = infection Or may be mild and easily overlooked Microbes that create an infection, may or may not result in a disease state. chlamydia, gonorrhea, herpes, human papillomavirus (HPV)
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Most STIs caused by single celled organisms bacteria, protozoa, fungi or viruses (microscopic parasites “machines”)
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Bacteria chlamydia gonorrhea syphilis bacterial vaginosis Protozoa trichomoniasis Fungus Candidiasis, yeast Viruses genital herpes human papillomavirus Hepatitis A, B & C HIV/AIDS Animals : - mites, scabies - nematodes
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Everywhere ! Mutualistic (helpful) Millions living in our gut: synthesize vitamins, digest milk proteins, break down plant products Pathogenic (harmful) Infections Irritations Death
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Three big ones: Syphilis Gonorrhea Chlamydia Antibiotics, but serious complications if not treated Bacteria that causes syphilis
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Most common STI in US – 3 to 5 million new cases each year Chlamydia trachomatis 75% women and 50% men asymptomatic Affects urinary tract and reproductive organs of men and women
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In women, two general types of genital Chlamydia infections Lower reproductive tract urethra or cervix inflammation Upper reproductive tract PID, Pelvic Inflammatory Disease Cervix w/ chlamydia infection
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In women Early symptoms Increased vaginal discharge 7-14 days after exposure burning urination vaginal bleeding between periods later symptoms: lower abdominal pain and low fever Untreated infection can lead to PID disrupted menstrual periods chronic pelvic pain fever, vomiting, nausea and
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Pelvic Inflammatory Disease (PID) leading cause of infertility and ectopic pregnancy Chlamydia trachomatis bacteria spreads into pelvic region infects endometrium, fallopian tubes and ovaries scar tissue in fallopian tubes may block passage of ovum to uterus or adhesions to uterus wall infertility, ectopic pregnancy
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Can be passed to the eye, causing trachoma
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This note was uploaded on 07/08/2011 for the course BIOL 301 taught by Professor Springer,m during the Spring '08 term at UC Riverside.

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Lecture_7_July_7_Bio_30 - Chicken pox and genital herpes...

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