Week 6 - Infections of the Genital Tract Flashcards
What is the most likely infective organism in a 19 year old female with no symptoms, mucopurulent discharge and cervical motion tenderness noted on speculum examination?
Chlamydia trachomatis - infections usually asymptomatic
Which infective organism causes a painless chancre in the early stages of infection?
Treponema pallidum
Describe the nature of the discharge produced by Trichomonas vaginalis infection.
- Foul-smelling
- Yellow-green vaginal discharge
What is the most likely infective organism in a patient presenting with vaginitis and a thin, grey vaginal discharge with a fishy, amine odour?
Gardnarella vaginalis
What is the nature of discharge produced by Candida albicans infection?
- Thick
- White
- Cottage-cheese like
What is the most likely infective organism for a male who is sexually active with symptoms of urethritis and whose urine sample showed the presence of gram-negative diplococci?
Chlamydia trachomatis
Which 2 organisms are the most common sexually transmitted organisms?
- Neisseria gonorrhoeae
2. Chlamydia trachomatis
Describe the structural features of Chlamydia trachomatis.
- Small
- Round/ovoid bacterium
- Rigid cell wall that resembles a gram negative envelope
- The morphology of the organism changes dependent on the stage in the life cycle
What is the normal vaginal pH range?
3.5-4.5
What is the dominant organism in normal vaginal flora?
Lactobacillus sp
Which microorganism is the pathogen that can cause bacterial vaginosis?
Gardnarella vaginalis
Which microorganism is the pathogen that can cause conjunctivitis in newborns?
Chlamydia trachomatis
State the causes of genital ulcers.
- Herpes simplex virus - HSV
- Syphilis
- Chanchroid - Haemophilus ducreyi
What can vesicles of Bullae be caused by?
HSV
State the causes of genital papules.
- Transient manifestations of STIs
- Condylomata acuminata - anogenital warts
- Umbilicated lesions of Molluscum contagiosum virus
State the important features of genital ulcers.
- Number
- Size
- Tenderness
- Base
- Edge
State the causative agents for non-gonococcal urethritis.
- Chlamydia trachomatis
- Mycoplasma
- Ureaplasma
- Trichomonas HSV
State the types of urethritis.
- Gonococcal urethritis
- Non-gonococcal urethritis
- Post-gonococcal urethritis
State the causes of vulvo-vaginitis.
- Candidiasis
- Trichomoniasis
- Staphylococcal
- Foreign body
- HSV
State the causes of cervicitis.
- C. trachomatis
- N. gonorrhoeae
- HSV
- HPV
State the causes of bartholinitis.
- Polymicrobial infections with endogenous flora
2. Rarely STIs
What features does a laboratory diagnosis of bacterial vaginosis consist of?
- Pungent odour with the KOH whiff test
- Vaginal pH of greater than 4.5
- Presence of clue cells on a wet mount lacking many PNMs
How is bacterial vaginosis thought to occur?
From a synergistic infection involving the overgrowth of normal bacterial flora including Gardnerella vaginalis
State the symptoms of bacterial vaginosis.
- Vaginal discharge
- Odour
- Itch
- Dyspareunia
- Soreness