STD's Flashcards
Gonorrhea is caused by what organism?
neisseria gonorrhoeae
If a gram stain shows gram negative diplococci, the most likely STD is?
gonorrhea
A female presenting with mucopurulent vaginal discharge is concerning for which STD?
=green discharge–> gonorrhea
A male presenting with white/yellow/green penile discharge is concerning for which STD?
gonorrhea
Diagnosis of gonorrhea
gram stain=GN diplococci cervical cx + N. gonorrhoeae using Thayer-Martin media
Treatment for gonorrhea
Ceftriaxone 250mg IM + Azithromycin 1gm PO x 1 report to health department
Which STD is most likely to involve multiple organ systems?
syphilis
What organism causes syphilis?
treponema pallidum
3rd most commonly reported infectious disease in US?
syphilis
Clinical manifestations of primary syphilis
PAINLESS chancre indurated ulcer erythema at site
Clinical manifestations of secondary syphilis
*flu-like sxs
*lymphadenopathy
*generalized macro-papular rash
-malaise -anorexia -alopecia -arthralgias
Which stage of syphilis is seropositive but asymptomatic?
latent syphilis
Serologic Tests for Syphilis
initial test: VDRL/RPR
confirmatory test: flourescent treponemal antibody absorption
Nontreponemal: VDRL/RPR Treponemal: FTA-ABS (flourescent treponemal antibody absorption); MHA-TP (microhemagglutination assay for antibody to T.pallidum)
Which serologic tests are used to confirm syphilis?
treponemal: flourescent treponemal antibody absorption
FTA-ABS , MHA-TP
Which serologic test confirms 100% of secondary syphilis cases?
FTA-ABS
What is the antibiotic of choice for syphilis?
PCN G
What is the treatment for primary, secondary or early syphilis (<1yr) syphilis?
PCN G 2.4 million unit IM
What is the treatment for late, latent/indeterminate stage & tertiary syphilis?
PCN G 2.4 million units IM weekly x 3 wks
If patient has PCN allergy, what is the treatment for syphilis?
Doxycycline 100mg BID or Erythromycin 500mg PO QID
Which is the most common STD in the US?
chlamydia (C in common= C in chlamydia)
Chlamydia is caused by what organism?
chlamydia trachomatis
Which STDs causes dyspareunia?
chlamydia & trichomonas
What are the 4 most common causes of dyspareunia?
-chlamydia -PID: trichomonas -menopause
If a male presents with thicky, cloudy penile discharge, which STD is of concern?
chlamydia
What is the most definitive test to confirm chlamydia?
culture (*but takes 3-9d for results)
What is the preferred method to test for chlamydia?
EIA (enzyme immunoassay) - 30-120min for result
Treatment for chlamydia
Azithromycin 1gm PO x 1` OR Doxycycline 100mg BID x 7 d
What are the most common causes of vulvovaginitis?
- trichomoniasis 2. bacterial vaginosis 3. candidiasis
Clinical presentation of trichomonas
-malodorous, frothy yellow-greenish discharge -pruritus -vaginal erythema -“strawberry patches” on cervix & vagina -dyspareunia -dysuria
“Strawberry patches” on the cervix are noted on pelvic exam. The most likely diagnosis is?
trichomonas
Malodorous, frothy, yellowish-green discharge is concerning for which STD?
trichomonas
Clinical presentation of bacterial vaginitis?
*“fishy” smelling discharge which is watery & gray -vaginal spotting
“Fishy” smelling discharge is concerning for which STD?
bacterial vaginosis
Diagnostic test for trichomonas?
microscopic wet prep: NS mixture shows motile trichomonads
Diagnostic test for bacterial vaginosis?
microscopic wet prep: NS mixture shows clue cells
Diagnostic test for candidiasis?
microscopic wet prep: KOH mixture shows pseudo hyphae
Treatment for trichomonas?
Flagyl 2g PO x 1
Treatment for bacterial vaginosis?
Flagyl 2g PO x 1 -Clindamycin vaginal cream 2% (5g) vag qHS x 7d or 300mg PO BID x 7d
Treatment for Candidiasis?
Miconazole (mono-stat) Clotrimazole Terconazole Butaconazole
Cause of chancroid?
hemophilis ducreyi
If gram stain shows GN bacillus, what is the most likely STD?
chancroid
Which STD(s) cause painful ulcers?
chancroid herpes
Treatment for chancroid
Azithro 1gm PO x 1 OR Ceftriaxone 250mg IM x 1
Which STD has no cure?
herpes
Which STD is associated with painful genital lesions?
herpes *lesions that Hurt= Herpes
Initial clinical presentation of herpes?
fever malaise dysuria **painful/pruritic ulcers usu x 12d
Clinical presentation of recurrent herpes
less painful/pruritic ulcers, usu x 5d
Most definitive test for herpes?
viral culture
Treatment of herpes?
-symptomatic tx w/drying & antipruritic agents -Acyclovir -Famciclovir -Valacyclovir
Which drug is especially helpful for asymptomatic viral shedding of HSV2?
Valacyclovir (valtrex) *10% of ppl shed all the time