STIs Flashcards
Most common STI
Chlamydia
Profuse penile discharge, pain on passing urin
Gonorrhoea
Chancre develops in which stage in syphily
primary
the great imitator ?—resembles many other sti
Syphilis
—resembles Genital herpes, chancroid
Which HSV type is viral shedding commonly seen in
HSV 2
—-more in the first year of infection
What is chlamydia appear as under the microscope?
gram negative
olbigate intracellular bacterium
What is the risk of PID from chlamydia ?
9%
What does a single PID episode increase the risk of ?
- ectopic pregnancy by 10 fold
- carries a risk of TUBAL factor infertility of 15-20%
How does Chlamydia present as?
- Post coital or intermenstrual bleeding
- Lower abdominal pain
- Dyspareunia
- Mucopurulent cervicitis
Present. in Males for chlamydia?
- milky, clear discharge
- dysuria
- urethritis
- epididymo-orchitis
- proctitis (LGV)
Complications of CT?
- PID (50%)
- REACTIVE arthtritis (can’t see,can’t pee, can’t bend my knee)
- ectopic pregnancy
- conjunctivitis
- transmission to neonate (conjunctivis and pneumonia)
- Fitz-hugh-curtis Syndrome (perihepatitis)
What advise when testing for CT in women?
-STOP testing for CT in women >25y.o with vaginal discharge (false +)
- do test on women who have had CT in the past year
(1 in5 women can be re-infected within 10 months after initial rx)
Where is L1-L3 serovars commonly diagnosed in? What are the symptoms?
- dx in MSM
- rectal pain, discharge and bleeding
What risk does having LGV hold?
- 67% HIV
- HIGH risk of CONCURRENT STI
How to dx chlamydia?
- NAAT (test for gonorrhoea too): vulvovaginal swab (no need speculum), first void urine
- MSM (do rectal swabs –if receptive ANAL intercourse)
RX of Chlamydia
- doxycycline (100mg BD x 7 days)
- Axithromycin (1g stat FOLLOWED by 500mg DAILY for 2 days)
What is mycoplasma genitalium a.w?
- non-gonococcal urethritis (15-25%)
- small a.w PID
How to test for M.Genitalium?
- NAAT test (same sample as GC/CT)
What is the incubation period of Gonorrhoea?
- urethral infect. in men is SHORT at 2-5 days
- 50-90% risk from INFECTED MAN to female partner
- —-20% risk from infected WOMan
Primary site of INFECTION for Gonorrhoea
urethra, endocervix, rectum, and pharynx.
Presentation of males for Gonorrhoea?
- <10 % is asymptomatic
- GREEN, YELLOW mucopurulent discharge from penis ( >80%)
- dysuria
- pharyngeal/ rectal infections (ASYMPTOMATIC; don’t forget to swab)
How does gonorrhoea present in females?
- UP TO 50%: ASYMPTOMATIC …esp. with pharyngeal and rectal infection
- increased vaginal discharge (40%
- dysuria
- ## PELVIC pain <5%
What is bartholinitis?
- SWOLLEN bartholin glands
WHat does gonorrhoea appear as undee the microscope?
- gram -ve, intracellular DIPLOCOCCI
What are the advantages of NAAT?
- non-invasive
- less trouble with storage, medium and transport
How to treat gonorrhoea?
- 1st line: Ceftriaxone 500mg IM
- second line: cefixime 400 mg AND azithromycin 2g oral (only if IM is c/i)
WHen should you ask the patient to come in?
- resampled AFTER 2 weeks
How does genital herpes primary infection present as?
Blistering and ulceration of the external genitalia Pain External dysuria Vaginal or urethral discharge Local lymphadenopathy Fever and myalgia (prodrome)
How long does genital herpes last?
14-21 days
How do the recurrent episodes of HSV-2 infection present as?
- usually UNILATERAL
- small blisters
- ulcers
- —minimal systemic symptoms (resolves in 5-7 days)
How to treat HSV?
- give ORAL antiviral (ACYCLOVIR)
- consider LIDOCAINE if very painful
- —saline bathing
- —-analgesia
How to dx HSV
- swab ulcer base for HSV PCR
Why is it important to know if a pregnant lady with HSV has had a previous herpetic episode ?
- -previous herpes episode means antibodies can be passed to the baby
- —-they don’t know if theyve had it ….do PCR of swab and serology tests for antibodies
What genotypes are covered by HPV vaccines?
hpv 6 and 11
HIGH risk types (this vaccine covers 90% of HPV cancers): HPV 16 and 18 and others
What genotypes are covered by HPV vaccines?
hpv 6 and 11
HIGH risk types (this vaccine covers 90% of HPV cancers): HPV 16 and 18 and others
- also available for MEN (esp. MSM)
What is HPV 16 and 18 a.w?
16,18 responsible for the vast majority of cervical, anal, penile, vulval and oropharyngealW
How long is the Incubation period of HPV?
- 3 weeks to 9 months
How are you most l likely going to obtain HPV infection?
—–from asymptomative partner
Where are genital warts usually found?
- occurs at site of friction
- —-ontriotikc entry to the vagina
How to treat HPV ?
- Podophyllotoxin (Warticon)
- Imiquimod (GOOD - its an immune modifier) —-used on anogenital warts
- Cryotherapy
- Electrocautery
How is syphilis transmitted?
Sexual contact
Trans-placental/during birth
Blood transfusions
Non-sexual contact – healthcare workers
How does one contract syphilis?
- may be acquired from years ago
- become symptomatically only recently
- —ps. RARE to develope to tertiary syphilis
How long is the Incubation period of Primary syphilis?
9-90 days (non-tender LOCAL lymphadenopathy)
-mean of 21 days
SYmptoms of SEcondary syphilis?
- rashes on hand, torso
- lymphadenopathy
- Lesions of mucous membranes
- Generalized Lymphadenopathy
- Patchy Alopecia
- Condylomata Lata (VERY infectious ) —-THE GREAT IMITATOR
What skin conditions develop with IIary syphilis?
- Macular/ follicular/ pustular
What to expect in follow-up for syphilis?
- until RPR is negative
- —titres should decrease four fold by 3- 6months
- —-serological relapse if titres increase by four fold
What is a.w PID?
Chlamydia
Disadvantages of NAAT?
- risk of FALSE positive
- —-NAAT usually confirms results
What are the advantages and disadv. of culture?
- allows antibiotic sensitivity
- monitoring
Disadv.: invasive test/specific medium and incubation needed
Advs of microscopy?
Disadvs?
- near pt dx
- timely rx
(-)ves: invasive/ low sensitivity/ requires confirmation
What is the incubation period of Genital Herpes?
3-6 days
Is syphilis always infectious?
ONLY Primary, Secondary and Early Latent stages are
What is the lesion of primary syphilis?
- primary chancre
- painless
- lesion at site of innoculation
- —-90% sites are genital
What serological tests specific to Treponema Pallidum?
- TPPA
- ELISA/EIA
- INNO-LIA
- FTA abs