STD Flashcards
Herpes Virus- pathophysiology
Most common infectious etiology of genital ulceration - 32-50% of adults infected
Often transmitted unknowingly – asymptomatic viral shedding
- Have the virus w/out any symptoms and still pass it
- Majority of cases undiagnosed
Herpes Virus- cause
HSV1/HSV2
Herpes Virus- S/S & PE
Multiple painful vesicles on erythematous base, persist - 7-10 days
- red halo
Primary – fever, bilateral adenopathy
- flu like symptoms
Recurrent – no fever
Prodrome – tingling or burning 18-36 hours prior lesion
Herpes Virus- labs & imaging
Serological testing high rate of false negative
Viral studies – TOC
- PCR - CSF
- Culture
Tzank smear – gold standard
- Pos = presence of multinucleated giant cells
- scrape base of wet lesion
Herpes Virus- treatment
First episode - 7-10 days
- Acyclovir – 400mg TID OR
- Acyclovir – 200mg 5x daily OR
- Famciclovir 250mg TID OR
- Valacyclovir 1000mg BID
Episodic therapy –
- Acyclovir – 400mg BID x 5days
- Acyclovir 800mg BID x 5 days
- Acyclovir 800mg TID x 2 days
- Famciclovir 125mg BID x 5 days
- Famciclovir 1000mg BID x 1day
- Valacyclovir 500mg BID x 3days
- Valacyclovir 1gm PO QD x 5days
Suppression – Daily
- Acyclovir – 400mg BID
- Famciclovir – 250mg BID
- Valacyclovir – 500-1000mg QD
- > > For those w/ >6outbreaks a year - Reduces frequency by 70-80%
Pregnancy
- No indicated risk that treatment will hurt fetus
- Acyclovir – used w/ 1st episode or severe recurrent disease
- Risk of transmission – 30-50% among women who acquire HSV near delivery
Herpes Virus- prognosis
Chronic, lifelong infection
Lesions will spontaneously heal and then reoccur
Herpes Virus- counseling
- Natural hx or infection, recurrence, asymptomatic shedding, transmission risk
- Use of episodic vs suppressive therapy
- Abstain from sexual activity when lesions or prodromal symptoms start
- Inform partners
Risk of neonatal infection - women w/out symptoms can deliver vaginally
- Ulcer present – c section
Syphilis- pathophysiology
Incidence inc - HIV + men and MSM, IV drug usage
- 71% inc
- Test for if HIV +
Syphilis- cause
Treponema pallidum - spirochete
Syphilis- S/S & PE
Primary: Incubation - 10-90d Chancre - early - macule/papule -> erodes - Late - clean based, painless, indurated ulcer w/ smooth firm borders - unnoticed in 15-30% of pts - Resolves in 1-5w - HIGHLY INFECTIOUS Secondary: - Hematogenous dissemination of spirochetes - Usually 2-8w after chancre appears - Rash - whole body - palms/soles - Mucous patches - condylomata lata - wart like presentation - HIGHLY Infection - Constitutional symptoms - Resolve in 2-10w Tertiary: - Gumma - soft, tumor like growth tissues - CV - neuro - eye - uveitis, optic neuritis
Syphilis- diagnosis
Early latent – reactive testing w/in 1 year of infection
- no symptoms
Late latent – reactive testing >1 year after onset of infection or timing can’t be determined
- No symptoms
Syphilis- labs & imaging
Darkfield examination of exudate/tissue – gold standard
Serologic testing:
Nontreponemal – RPR, VDRL
- Reactivity fades over time – can treat them down
Treponemal – fluorescent treponemal ab (FTA-ab)
- Once positive – stays positive -> can’t treat it down
Syphilis- treatment
Primary, secondary, early latent:
1st line – Benzathine Penicillin G 2.4mill units IM one dose
Allergy
- Doxy 100mg BID x 14days
- Ceftriaxone 1gm IM/IV QD x 8-10days
- Azithromycin 2gm single dose
Tertiary – Pen G 2.4mill units IM Qweek x 3 weeks – Bicillin LA
Pregnancy
- Screen at 1st prenatal visit – repeat 3rd trimester
- Treat for appropriate stage
- Additional? – benzathine penicillin 2.4mu IM after initial dose for prim, sec, early latent
- U/S 2nd half – eval congenital syphilis
—> Congenital syphilis – 40% die or stillborn
—–> Nerve damage – vision and hearing
Syphilis- prognosis
Jarish-Herxheimerr
- occurs w/in 24hr of treatment
- acture febrile rxn - HA, myalgia, fever
- antipyretics
Syphilis- management of sex partners
Management of sex partners:
- Exposure to primary, secondary, early latent w/in 90days – treat presumptively - PenG
- Exposure to primary, secondary, early latent >90days – treat presumptively if serology not available – Pen G
- Exposure to latent w/ high nontreponemal titers >1:32 – treat presumptively for early
Chancroid- pathophysiology
Declining
Risk for transmitting HIV
Chancroid- cause
Hemophilus ducreyi
Chancroid- S/S & PE
vesicle, papule, pustule, ulcer
– soft, not indurated, very painful
Classic - painful ulcer w/ tender inguinal adenopathy
Chancroid- diagnosis
Diff to diagnose – hard to culture
Chancroid- labs & imaging
Culture
Chancroid- treatment
Azithromycin 1gm PO
Ceftriaxone 250mg IM single dose
Ciprofloxacin 500mg BID x 3days – contra in Prego
Erythromycin base 500mg TID x 7days
Sex partners
- Exam and treat symptomatic or not if <10 to contact from onset
Chancroid- prognosis
Manage
- Reexam in 3-7days post treatment
- Time for healing – related to ulcer size
- Lack of improvement – incorrect diagnosis, coinfection, noncompliance, antimicrobial resistance
- Lymphadenopathy -> drainage
Lymphogranuloma Venereum- cause
Chlamydia trachomatis
Lymphogranuloma Venereum- S/S & PE
5–21-day incubation
painless papule, vesicle, ulcer
Tender regional lymphadenopathy – unilateral
Lymphogranuloma Venereum- treatment
1st line – Doxy 100mg BID x 21days
2nd – Erythromycin
Granuloma inguinale- pathophysiology
Rare in US
Granuloma inguinale0 cause
Klebsiella granulomatis
- Calymmatobacterium
Granuloma inguinale- S/S & PE
9–50-day incubation
Painless papule -> ulcerations
No regional lymph nodes
Donovanosis
Granuloma inguinale- labs & imaging
Culture - donovan bodies
Granuloma inguinale- treatment
1st line - Doxy 100mg QD x 3w
Azithromycin 1gm once w x 3w
Cipro 750mg BID x 3w
Trimethoprim-sulfa - 800mg/160mg BID
Gonorrhea- pathophysiology
2nd most common reported infection yearly
Gonorrhea- cause
Neisseia gonorrhea
Gonorrhea- S/S & PE
Urethritis - Male
- urethral inflammation
- incubation - 1-14days
- S/S - dysuria, urethral discharge
Urogenital infection - female
- Endocervical canal - primary site
- urethra also - 70-90%
- Incubation - unclear, 10d?
- S/S - asymptomatic, vaingal discharge, dysuria, urination, labial pain/swelling, abd pain
- Bartholin’s abscess - masupilation -> I&D and sew it back up
Skin lesion, arthritis - disseminate gonorrhea
PID
Gonorrhea- labs & imaging
NAAT - urine - TOC
Gram stain - Gold
- gram negative diplococi intracellular
Culture
Gonorrhea- treatment
Cervix, urethra, rectum, pharynx:
Ceftriaxone 250mg IM single dose + Azithromycin 1g PO single dose
Disseminated Gonococcal
- 1st line - Ceftriaxone 1gm IM or IV Q 24hr
- 2nd - Cefotaxime orr Ceftizoxime 1gm IV Q8hr
Gonorrhea- prognosis
Resistance
- penicillin and tetracycline - geographic
- non to ceftriaxone
- Fluoroquinolone worldwide
- Surveillance crucial for therapy
Nongonococcal Urethritis- cause
C. Trachomatis - 20-40% Genital mycoplasmas - 20-30% - Ureaplasma urealyticum - Mycoplasma genitalium Trichomonas vaginalis HSV Unkown - 50%
Nongonococcal Urethritis- S/S & PE
Mild dysuria
Mucoid discharge
Nongonococcal Urethritis- diagnosis
Urethral smear - >5PMN
Urine microscopic - >10PMN
Pos Leukocyte esterase