Sexual health Flashcards
Conditions and Presentations
Syphilis
sexually transmitted infection caused by the spirochaete Treponema pallidum.
Infection is characterised by primary, secondary and tertiary stages.
The incubation period is between 9-90 days
Primary features Syphilis
chancre - painless ulcer at the site of sexual contact
local non-tender lymphadenopathy
often not seen in women (the lesion may be on the cervix)
secondary features Syphilis
- occurs 6-10 weeks after primary infection
systemic symptoms: fevers, lymphadenopathy
rash on trunk, palms and soles
buccal ‘snail track’ ulcers (30%)
condylomata lata (painless, warty lesions on the genitalia )
Tertiary features of Syphilis
gummas (granulomatous lesions of the skin and bones)
ascending aortic aneurysms
general paralysis of the insane
tabes dorsalis
Argyll-Robertson pupil
Features of congenital syphilis (6)
- blunted upper incisor teeth (Hutchinson’s teeth), ‘mulberry’ molars
- rhagades (linear scars at the angle of the mouth)
- keratitis
- saber shins
- saddle nose
- deafness
Investigations of syphilis
Treponema pallidum is a very sensitive organism and cannot be grown on artificial media.
The diagnosis is therefore usually based on clinical features, serology and microscopic examination of infected tissue.
Non-treponemal tests
- not specific for syphilis, therefore may result in false positives
- based upon the reactivity of serum from infected patients to a cardiolipin-cholesterol-lecithin antigen
- assesses the quantity of antibodies being produced
- becomes negative after treatment
- examples include: rapid plasma reagin (RPR) and Venereal Disease Research Laboratory (VDRL)
treponemal-specific tests
generally more complex and expensive but specific for syphilis
qualitative only and are reported as ‘reactive’ or ‘non-reactive’
examples include: TP-EIA (T. pallidum enzyme immunoassay), TPHA (T. pallidum HaemAgglutination test)
the TP-EIA test has become increasingly popular in recent years
Reasons for false positives on non-treponemal tests
pregnancy
SLE, anti-phospholipid syndrome
tuberculosis
leprosy
malaria
HIV
Interpretating test results for syphilis
Positive non-treponemal test + positive treponemal test
consistent with active syphilis infection
Positive non-treponemal test + negative treponemal test
consistent with a false-positive syphilis result e.g. due to pregnancy or SLE (see list above)
Negative non-treponemal test + positive treponemal test :
consistent with successfully treated syphilis
Managment of syphilis
intramuscular benzathine penicillin is the first-line management
alternatives: doxycycline
Jarisch-Herxheimer reaction
fever, rash, tachycardia after the first dose of antibiotic
in contrast to anaphylaxis, there is no wheeze or hypotension
it is thought to be due to the release of endotoxins following bacterial death and typically occurs within a few hours of treatment
no treatment is needed other than antipyretics if required
Gonorrhea
Gonorrhea is a sexually transmitted infection (STI) caused by the bacterium Neisseria gonorrhoeae. It primarily affects the mucous membranes of the genital tract, but it can also infect the rectum, throat, and eyes
gram positive diplococci
Transmission of gonorrhea
Gonorrhea is spread through sexual contact with an infected person, including vaginal, anal, or oral sex. It can also be transmitted from mother to baby during childbirth.
Male symptoms of gonnorhea
Urethral discharge (pus-like or milky discharge from the penis)
Pain or burning sensation during urination
Testicular pain or swelling
Female symtpoms of gonorrhea
Vaginal discharge (often greenish or yellowish)
Pain or burning sensation during urination
Pelvic pain
Abnormal vaginal bleeding
asymptomatic causes
complications of gonorrhea
Pelvic inflammatory disease (PID) in women, leading to infertility or ectopic pregnancy
Epididymitis (inflammation of the epididymis) in men, leading to infertility
Disseminated gonococcal infection (DGI), causing joint pain, skin rash, and fever
Increased risk of HIV transmission
Conjunctivitis (eye infection) in newborns born to infected mothers
Diagnosis of gonorrhea
Nucleic acid amplification tests (NAATs) on urine, vaginal, cervical, rectal, or throat swabs
Gram stain or culture of urethral, cervical, or rectal specimens
Examination of discharge or lesions under a microscope
Treatment of gonorrhea
Antibiotic therapy with dual therapy (typically ceftriaxone plus azithromycin) to reduce the risk of antibiotic resistance
Treatment of sexual partners to prevent reinfection and further transmission
Follow-up testing to ensure successful treatment and to detect reinfection
Prevention of gonorrhea
Abstinence or mutual monogamy with an uninfected partner
Correct and consistent use of condoms during sexual activity
Routine screening for gonorrhea and other STIs, especially in high-risk populations
Vaccination (if available in the future)
Prognosis of Gonorrhea
Gonorrhea is curable with appropriate antibiotic treatment, but reinfection is common without behavioral changes or partner treatment.
Early detection and treatment are essential to prevent complications and reduce the risk of transmission.
Chlamydia
most prevalent sexually transmitted infection in the UK and is caused by Chlamydia trachomatis, an obligate intracellular pathogen
1 in 10 young women in the UK have Chlamydia. The incubation period is around 7-21 days, although it should be remembered a large percentage of cases are asymptomatic
Features of Chlamydia
asymptomatic in around 70% of women and 50% of men
women: cervicitis (discharge, bleeding), dysuria
men: urethral discharge, dysuria
complications of Chlamydia
epididymitis
pelvic inflammatory disease
endometritis
increased incidence of ectopic pregnancies
infertility
reactive arthritis
perihepatitis (Fitz-Hugh-Curtis syndrome)