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On Sexually Transmitted Infections:
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What are Sexually transmitted infections (STIs)?
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These are infections obtained by having unprotected sexual intercourse with a partner who has the infection. Sexual exposure may either be oral, vaginal-penile intercourse, anal penile intercourse. There are other STI that can be obtained through other means such as blood transfusion or by mere body contacts or through "fomites". One has to know how to prevent getting these infections.
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What are the types of STIs?
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STIs are classified according to the following:
a) Discharge syndromes - those that produces discharge. Eg. Gonorrhea, non gonococcal urethritis, post gonoccocal urethritis, vaginitis, candidiasis, trichomoniasis
b) Ulcerative syndromes- those infections that produces papular or skin ulcer lesions eg.herpes simplex, syphillis and chancroid
c) Non ulcerative syndromes - eg. Scabies, venereal warts, crab lice
d) Others - eg. Hepatitis B, Infections mononucleosis, and HIV/AIDS
The following table shows you the difference among the different STIs:
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| A. Discharge (Tulo) |
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Type |
Incubation Period |
Causative Agent |
Signs and Symptoms |
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1. Gonorrhea
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2-7 days
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Neisseria gonorrhea
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vaginal & urethral discharge
foul-smelling, yellow to yellow green, possibly pus-like, thick
areas affected : urethra, anus, throat, vagina, joints, eyes
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2. Non-gonoccal urethritis (NGU), Post-gonoccal urethritis (PGU)
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10-14 days
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Chlamydia trachomatis
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itchiness, urethral discharge
whitish, mucoid/less in quatity
areas affected : urethra, eyes, vagina, throat, anus
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3. Vaginitis
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3-7 days
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Gardnella
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opaque-white discharge
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4. Candidiasis/ Moniliasis
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7-10 days
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C Albicans yeast (fungus)
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itchiness, white-cheesy, curd-like vaginal discharge
sweet smelling
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5. Trichomoniasis
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7-14 days
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protozoa
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greyish-greenish, frothy, fishy odor, copious discharges
strawberry cervix
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B. Ulcerative
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Type |
Incubation Period |
Causative Agent |
Signs and Symptoms |
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1. Syphilis
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9-90 days
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Treponema pallidum
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1st stage : chancre (firm, hard, painless ulcer, oval/round, well-delineated, usually solitary, heals in 2-6 weeks (with or without treatment)
2nd stage : rash on body (not itchy), areas affected: follicles, mucous areas; lymphadenopathy,"flu-like" can be latent for years
3rd stage: gumma, aneurysm, neurosyphilis (may cause stroke); may affect heart, brain (meningitis), bones; can be fatal
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2. Herpes simplex
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2-10 days
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Herpes simplex virus 1 (HSV-1) oral-facial,
Herpes simplex virus 2 (HSV-2) -genital
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multiple, painful shallow ulcers (cold sores)
affected areas: genitals, face, fingers, eyes, brain
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3. Chancroid
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3-10 days
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Haemophilus ducreyi
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soft & tender ulcer
painful, dirty-grey ulcers
painful & enlarged lymphnodes (buboes)
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C. Non-Ulcerative
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Type |
Incubation Period |
Causative Agent |
Signs and Symptoms |
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1. Scabies
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7-10 days
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Sarcoptes scabiei
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"galis-aso"
itchiness at night
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2. Venereal warts
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7-10 days
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Human papilloma virus (type 6&11)
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"kulugo"
warts in genitals
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3. Crab lice
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7-10 days
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Phthiuris pubis
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itchiness
nits ("jkuto sa buhok sa ari")
reddish brown pinpoint marks/bite marks
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D. Others
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Type |
Incubation Period |
Causative Agent |
Signs and Symptoms |
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1. Hepatitis B
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6 weeks - 6 months
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Hepatitis B virus
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jaundice, abdominal pains, chalk-colored stools
"flu-like"
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2. Infectious mononucleosis
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7-10 days
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Epstein Barr virus
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kissing disease
flu-like symptoms
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3. AIDS
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3-12 years
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HIV
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depending on opportunistic infections that set in
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What are the general principles as with regards to STIs?
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Co-infections are common
An individual may have more than one form of STI Investigate.
No single STI can be regarded as an isolated problem.
An infected partner always exists!
The sexual history and the management of the sexual partners are of imminent importance.
Self-medication leads to resistance to antibiotics and complicates what would have been a simple treatment.
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What is the relationship of STI with HIV/AIDS?
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STIs and HIV
- STIs give reference to sexual behavior.
- STIs serve as co-factors to HIV (genital ulcers, history of STD increase probability of acquiring HIV)
- STIs provide an environment that is favorable for HIV.
- STIs complicate treatment plan of a PWA.
HIV and STIs
- HIV makes a person more susceptible to STIs (or any diseases) secondary to immune deficiency.
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What are the other classifications of STIs ?
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A. STIs with genital discharge
- Gonorrhea
- NGU (Non-gonococcal urethritis)
- PGU (Post- gonoccal urethritis)
B. STIs with ulcers
- Syphilis
- Chancroid
- Herpes simplex
- Lymphogranuloma venereum
- Granuloma inguinale
C. STIs with no ulcer or discharge
- Venereal warts
- Scabies
- Phthiuris pubis
- Hepatitis B
D. Genital diseases almost exclusively found in women
- Candidiasis/ Moniliasis
- Trichomoniasis
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What are the classifications of STI according to Modes of transmission?
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A. Sexual transmissions
All STIs except Infectious mononucleosis, trichomoniasis, cadidiasis/moniliasis
B. Blood transfusion
- Syphilis
- Hepatitis B
C. Perinatal transmission (mother-child)
- Syphilis
- Hepatitis B B
- Herpes simplex
- Gonorrhea
D. Non-sexual contact
- Syphilis - contact with abraded skin
- Herpes simplex- contact with abraded skin
- Venereal warts- contact with infectious lesions
- Scabies -clothing or linen
E. Kissing
- Infectious mononucleosis
- Herpes simplex
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