What are the types of STIs?

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:
A. Discharge (Tulo)
Type Incubation Period Causative Agent Signs and Symptoms
1. Gonorrhea 2-7 days Neisseria gonorrhea
  • vaginal & urethral discharge

  • foul-smelling, yellow to yellow green, possibly pus-like, thick

  • areas affected : urethra, anus, throat, vagina, joints, eyes

  • 2. Non-gonoccal urethritis (NGU), Post-gonoccal urethritis (PGU) 10-14 days Chlamydia trachomatis
  • itchiness, urethral discharge

  • whitish, mucoid/less in quatity

  • areas affected : urethra, eyes, vagina, throat, anus

  • 3. Vaginitis 3-7 days Gardnella
  • opaque-white discharge

  • 4. Candidiasis/ Moniliasis 7-10 days C Albicans yeast (fungus)
  • itchiness, white-cheesy, curd-like vaginal discharge

  • sweet smelling

  • 5. Trichomoniasis 7-14 days protozoa
  • greyish-greenish, frothy, fishy odor, copious discharges

  • strawberry cervix

  • B. Ulcerative
    Type Incubation Period Causative Agent Signs and Symptoms
    1. Syphilis 9-90 days Treponema pallidum
  • 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

  • 2. Herpes simplex 2-10 days Herpes simplex virus 1 (HSV-1) oral-facial, Herpes simplex virus 2 (HSV-2) -genital
  • multiple, painful shallow ulcers (cold sores)

  • affected areas: genitals, face, fingers, eyes, brain

  • 3. Chancroid 3-10 days Haemophilus ducreyi
  • soft & tender ulcer

  • painful, dirty-grey ulcers

  • painful & enlarged lymphnodes (buboes)

  • C. Non-Ulcerative
    Type Incubation Period Causative Agent Signs and Symptoms
    1. Scabies 7-10 days Sarcoptes scabiei
  • "galis-aso"

  • itchiness at night

  • 2. Venereal warts 7-10 days Human papilloma virus (type 6&11)
  • "kulugo"

  • warts in genitals

  • 3. Crab lice 7-10 days Phthiuris pubis
  • itchiness

  • nits ("jkuto sa buhok sa ari")

  • reddish brown pinpoint marks/bite marks

  • D. Others
    Type Incubation Period Causative Agent Signs and Symptoms
    1. Hepatitis B 6 weeks - 6 months Hepatitis B virus
  • jaundice, abdominal pains, chalk-colored stools

  • "flu-like"

  • 2. Infectious mononucleosis 7-10 days Epstein Barr virus
  • kissing disease

  • flu-like symptoms

  • 3. AIDS 3-12 years HIV
  • depending on opportunistic infections that set in

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