STIs 2 Flashcards
How is syphilis usually transmitted?
Direct sexual contact of the mucous membranes
What are the major symptoms of Syphilis? Which happens first, and which later?
Lesion at the point of entry initially
Generalized maculopapular rash later
Latency period
What are the two outcomes of the latency period of Syphilis?
Reappearance decades later
Immune clearance
What is the gram stain and morphology of treponema pallidum? Are they motile?
Thin, Gran negative spirochete
Motile
Is Treponema pallidum aerobic or anaerobic?
Microaerophilic –sensitive to oxygen toxicity
True or false: Treponema Pallidum is sensitive to heat, drying and disinfectants?
True
Does Treponema pallidum grow in culture? Does it stain? What is the consequence of this?
No–thus we know less about it than other bacteria
What is the causative agent of Syphilis?
Treponema Pallidum
What allows the spirochete structure of Treponema pallidum to be flexible?
Axial fibrils/edoflagella
Can you gram stain Treponema pallidum?
No–too thin
What is the best technique to visualize Treponema pallidum ?
Dark-field microscopy or fluorescent
How is Treponema pallidum transmitted?
Sexual contact or congential
What is the symptom of primary syphilis?
One PAINLESS, indurated skin lesions at the site of infection
What causes the lesion caused by Syphilis? How long does this last?
immune response
last for weeks to two months
What is the clinical sign of disseminated syphilis (2)? Are they infectious at this time?
Diffuse rash (including PALMS and SOLES) with flu-like syndrome
VERY infectious
What are the raised lesions that syphilis causes called? Where are these found on the body?
Condylomata lata–found in skin folds
How long does latent, asymptomatic syphilis last?
few years to decades
Is transmission possible during a latent infection with syphilis?
Yes, from relapse in secondary lesions or blood transfusions
What are the symptoms of tertiary syphilis?
Diffuse, chronic inflammation
What fraction of pts will go on to develop tertiary syphilis?
1/3
What are the lesions found on tertiary syphilis infections? Where are these found? What causes these?
Gummas–skin bone, other tissues. Caused by hyperimmune reaction
What are the two most devestating consequences of syphilis?
Neurosyphilis
Cardiosyphilis
What is the treatment of syphilis?
high-dose IV PCN
What are the symptoms of neurosyphilis?
Progressive decline in mentation, behavioral changes (dementia)
What are the symptoms of congenital syphilis? (4) How is this transmitted?
Mother to fetus transmission
- Saddle nose (chronic rhinitis).
- Maculopapular rash
- Teeth and bone malformations
- Blindness
What is Hutchinsons triad?
Teeth, blindness, deafness
What are the microbes that may pass from mother to fetus?
Toxoplasma Rubella CMV HIV Herpes Syphilis
(ToRCHeS)
How do you diagnose Syphilis?
Darkfield microscopy or direct fluorescence
Serology
Can you culture Treponema pallidum?
Nope
What is the nontreponemal test for syphilis?
Measures cardiolipin antibodies (RPR, VDRL)
What is the treponemal test for syphilis?
Detects antibodies specific to Treponema pallidum
What happens to the sensitivity of treponemal and nontreponemal test as you move from primary to secondary etc?
higher % of pts with a positive test
What is the treatment for syphilis?
PCN
What is the preventative measure for syphilis?
Condoms
What are the symptoms of non-gonococcal urethritis (NGU)?
Hematuria/dysuria/frequency
Abdo pain
Discharge
Dyspareunia
All pts with urethritis should be tested for what?
Gonorrhea and chlamydia
What are the causes of non-gonococcal urethritis? (3)
Usually Chlamydia
Mycoplasm genitaloium
Ureaplasma uralyticum
Do mycoplasma or ureaplasma have a cell wall? What is the significance of this (2)?
No–Resistant to PCNs cephalosporins etc and cannot stain
What do mycoplasma and ureaplasma have in their cell walls?
Sterols
Are mycoplasma and ureaplasma intracellular or extracellular pathogens?
Extracellular
What is the culture morphology of mycoplasma/ureaplasma?
Fried egg appearance
True or false: M. Genitalium and M. Hominius are normal flora of the UG tract
True
What does M. genitalium cause in men and women?
Men-NGU
Women- PID
What is M. genitalium resistant to? What is the significance of this?
Resistant to doxycyline–thus if you treat them, it’s not chlamydia
What are the symptoms or ureaplasma?
NGU in men
What is the treatment for ureaplasma?
Doxy
What is chancroid?
STD caused by hemophilus ducreyi
How common is chancroid?
very uncommon at the moment
What is the gram stain and morph of haemophilus ducreyi?
gram negative pleomoprhic coccobaccilus
Is Hemophilus ducreyi catalase positive?
yes
What are the X and V factors that are needed to grow Haemophilus? What is the agar that is needed?
X= Hemin
V- NAD
Chocolate agar
What are the symptoms of Haemophilis ducreyi?
PAINFUL and soft lesion at the site of infection
Inguinal lymphadenopathy
What is the treatment for haemophius cudreyi?
Macrolides
How do you diagnose haemophilus ducreyi?
Chocolate agar with vanco
How many lesions are seen with haemohiluius duceryi? How does this compare to chancroid?
Multiple for haemophilus (painful)
One for chancroid (painless)
What is donovanosis or granulma inguinale cause by?
Klebsiella granulomatis
What is the gram stain, morpho of Klebsiella?
Gram negative rod that is encapsulated
What are the symptoms of donovanosis?
Painless wart-like lesions
What are the sequlae of donovanosis ?
Significant genital damage
What is the treatment for donovanosis?
Tetracycline/cipro
How do you diagnose donovanosis ?
Apperance of Donovan bodies in pathological specimens
What are the two main things in your differential when there is a genital/anal ulcers?
Herpes vs syphilis
All pts with GUD should be evaluated for what three infections?
Syphilis
Herpes
H. ducreyi
How long does it take for disseminated syphilis to appear after the appearance of the painless lesion?
2-8 weeks
Which test will have a negative result after treatment: the treponemal test, or the non-treponemal test?
The non-treponemal test
What are the only bacteria that have sterols in their cell membrane?
Ureaplasma
Mycoplasma
What species of mycoplasma causes disease? Ureaplasma?
M. genialium
U. urealyticum
What is the treatment for NGU?
Azithromycin
A patient comes into your office with urethritis. You are unable to culture or successfully identify what the causative agent of his pain, but the clinical picture would suggest chlamydia or possibly gonorrhea. As such, you prescribe Doxycycline/a macrolide and send him on his way. A week later, after finishing his course of abx, he reports that he still is still symptomatic. What is the probable source of his infection, and what should the next step in treatment be?
Probably caused by NGU caused by mycoplasma (but not ureaplasma)
Next step should be treatment with azithromycin
Is there urethritis with syphilis?
no