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PR3124 > STD > Flashcards

STD Flashcards

1
Q

Definition of STI

A

STI is an infection caused by bacteria, viruses, fungi and protozoa, which can be transmitted through sexual intercourse or close body contact with another person that is infected with STI
aka STI or VD (venereal disease)

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2
Q

STI caused by bacteria

A
  1. Gonorrhoeae (Neisseria gonorrhoeae)
  2. Chlamydia (Chlamydia trachomatis) (non-gonorrhoeae urethritis)
  3. Syphillis (Treponema pallidum)
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3
Q

STI caused by viruses

A
  1. Ano-genital warts (HPV)
  2. Ano-genital herpes (HSV)
  3. AIDS/HIV
  4. Molluscum contagiosum
  5. Viral hepatitis (hep A/B/C)
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4
Q

STI caused by fungi

A
  1. Vagina candidiasis
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5
Q

STI caused by protozoa (parasites)

A
  1. Scabies

2. Pediculosis pubis

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6
Q

Legally notifiable STI

A
  • notify within 72h of diagnosis
  • for monitoring and evaluation of national control
  • all STI EXCEPT HIV are not for contact tracing purposes
  • only req demographic data (age, gender, nationality, ethnicity)
  • partner notification in HIV/AIDS is mandatory
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7
Q

Mode of transmission of HIV

A
  • sexual contact mainly
  • direct contact of broken skin with open sores, blood or genital discharges
  • contaminated blood
  • infected mother to child (through placenta during pregnancy, child birth and breastfeeding)
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8
Q

Risk factors of STI

A
  • unprotected sex
  • number of sexual partner
  • MSM
  • CSW
  • illicit drug use
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9
Q

Individual prevention methods

A
  • barrier contraceptive methods
  • abstinence and reduce sexual partners (long-term, mutually monogamous relationship)
  • avoid drug abuse and sharing needles
  • pre-exposure to vaccines (HPV, hepA and hepB)
  • pre and post prophylaxis (HIV)
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10
Q

Importance of managing and prevention of STD

A
  • protect the babies
  • reduce related morbidities and progression to complicated diseases
  • prevent HIV infection
  • prevent serious complications in women (eg infertility)
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11
Q

Gonorrhoeae pathogen

A
  • bacteria
  • Neisseria gonorrhoeae
  • intercellular gram-ve, diplococci
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12
Q

Transmission of Gonorrhoeae

A

Sexual contact and mother-child during child birth

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13
Q

Diagnosis of Gonorrhoeae

A
  • gram staining of genital discharge
  • bacterial culture
  • NAAT (PCR)
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14
Q

Infection site of Gonorrhoeae

A
  • urethritis
  • proctitis (rectal)
  • cervititis
  • pharyngitis
  • conjunctivitis
  • disseminated (throughout systemic circulation)
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15
Q

Symptoms of Gonorrhoeae

A
  • urinary frequency
  • dysuria
  • purulent genital discharge
    can be asymptomatic
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16
Q

Complications of Gonorrhoeae

A 
Males : 
- prostatitis
- epididymitis
- urethral stricture
- disseminated disease
Females : 
- pelvic inflammatory disease 
- ectopic pregnancy
- infertility
- disseminated disease
Both (disseminated) : 
- skin lesions
- tenosynovitis 
- monoarticular arthritis
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17
Q

Treatment for Gonorrhoeae

A

1st line :
IM Ceftriaxone 500mg single dose (if <150kg), PO Doxycycline 100mg BD x 7 days (unless Chlamydia infection is excluded)
Alternatives :
- IM Gentamicin 240mg single dose + PO Azithromycin 2g single dose
- PO Cefixime 800mg single dose, PO Doxycycline 100mg BD x 7 days (unless Chlamydia infection is excluded)

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18
Q

Management of sex partners (Gonorrhoeae)

A
  • evaluation and treatment for sex partners in the last 60 days or the last sex partner if more than 60 days
  • abstain from sexual activity for 7 days after treatment and resolution of symptoms
  • abstain from sexual intercourse until all sex partners have been treated to minimise risk of re-infection
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19
Q

Chlamydia pathogen

A
  • bacteria

- Chlamydia trachomatis

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20
Q

Transmission of Chlamydia

A

Sexual contact and mother-child during child birth

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21
Q

Diagnosis of Chlamydia

A
  • antigen detection

- NAAT

22
Q

Symptoms of Chlamydia

A
  • urinary frequency
  • dysuria
  • purulent genital discharge
    can be asymptomatic
23
Q

Treatment for Chlamydia

A 
1st line : 
PO Doxycycline 100mg BD x 7 days
Alternatives : 
PO Azithromycin 1g single dose
PO Levofloxacin 500mg OD x 7 days
24
Q

Management of sex partners (Chlamydia)

A
  • evaluation and treatment for sex partners in the last 60 days or the last sex partner if more than 60 days
  • abstain from sexual activity for 7 days after single dose treatment or until end of 7 day dosing regimen and resolution of symptoms
  • abstain from sexual intercourse until all sex partners have been treated to minimise risk of re-infection
25
Q

Syphilis pathogen

A
  • bacteria
  • Treponema pallidum
  • spirochete
26
Q

Diagnosis of Syphillis

A
  • darkfield microscopy

- 2 serological test for antibodies (treponemal & non-treponemal)

27
Q

Stages of Syphillis (5)

A
  1. Primary (external genitalia, perianal region, mouth and throat)
  2. Secondary (multisystem - lymphadenopathy, and hematogenous spread)
  3. Latent (asymptomatic)
  4. Tertiary (multisystem - heart, eyes, bones, joints)
  5. Neusyphillis (any stage also can)
28
Q

2 serological tests for Syphillis

A
  1. Treponemal test
    - TPHA, TPPA
    - use treponema antigen to detect treponema antibodies
    - confirmatory tests
    - remains reactive for life, hence not useful for monitoring
  2. Non-treponemal test
    - VDRL (venereal disease research laboratory) , RPR (rapid plasma region)
    - use non-treponema antigen (cardiolipin) to detect treponema antibodies
    - reports most diluted serum concentration with a positive reaction
    - antibodies titres correlates with disease activity
    - VDRL and RPR are not inter-changeable, if use VDRL, use VDRL throughout monitoring
    - less specific hence used as a screening tool
29
Q

Treatment for Syphillis

A

Primary, secondary and latent stage :

  • IM Benzathine Pen G 2.4 MU single dose
  • PO Doxycycline 100mg BD x 14 days

Late latent and tertiary stage :

  • IM Benzathine Pen G 2.4 MU once weekly x 3 doses
  • PO Doxycycline 100mg BD x 28 days

Neurosyphillis :

  • IV Crystalline Pen G 3-4 MU q4h x 10-14 days
  • IV Crystalline Pen G 18-24/day MU infusion x 10-14 days
  • IM Procaine Pen G 2.4 MU OD + PO Probenecid 500mg QDS/QID x 10-14 days
  • IV/IM Ceftriaxone 2g OD x 10-14 days
30
Q

Monitoring of Syphillis treatment

A
  • Jarisch-Herxheimer reaction (fever, myalgia) within 24h of treatment
  • Treatment success if at least 4 fold decrease in VDRL/RPR tire at 6 months w/o signs or symptoms

primary and secondary : 6 and 12 month
latent and tertiary : 6, 12 and 24 months
neurosyphillis : every 6 months until CSF normal

31
Q

Management of sex partners (syphillis)

A
  • evaluation and treatment for sex partners
  • abstain from sexual activity for 7 days after single dose treatment or until end of 7 day dosing regimen and resolution of symptoms
32
Q

Human Herpes Virus

A
  • double stranded DNA
  • enveloped
  • latent stage present
33
Q

Types of Human Herpes Viruses

A
  1. HSV 1 (cold sores)
  2. HSV 2 (genital herpes)
  3. VZV (chicken pox and shingles)
34
Q

Treatment for varicella / shingles

A

Within 24-48h
1. PO Acyclovir 800mg 5 times a day x 7 days
2 PO Valacyclovir 1g TDS x 7 days

35
Q

Prevention of varicella and shingles

A

Vaccination

36
Q

Are varicella and shingles STI?

A

No

37
Q

Genital herpes pathogens

A

HSV 2 > HSV 1

38
Q

Symptoms of varicella

A
  • fever starts 1-2 days before rash appears and lasts 4-5 days, abates once all rash have appeared
  • new lesions appear over 4-7 days
39
Q

Symptoms of shingles

A
  • new lesions appear over 3-5 days
  • dries with crusting in 7-10 days
  • rash is preceded by tingling/itching/pain for 2-3 days
  • post-herpetic neuralgia in 10-50% of patients, may persists for many months or years
40
Q

Symptoms of genital herpes

A
  • vesicles develop over 7-10 days and heal in 2-4 weeks

- asymptomatic viral shedding possible

41
Q

Stages of genital herpes

A
  1. Mucocutaneous infection
  2. Nerve ganglia infection
  3. Latency
  4. Reactivation
  5. Recurrent flares
42
Q

Transmission of genital herpes

A
  1. Transfer of body fluids
  2. Intimate skin-skin contact
  3. Asymptomatic transmission via viral shedding
43
Q

Natural history of genital herpes

A

It is a chronic and life-long disease

44
Q

Symptoms of genital herpes

A
  • classical painful multiple vesicular or ulcerative lesions
  • local itching, pain, tender inguinal lymphadenopathy
  • flu-like symptoms first few days of lesion appearance (fever, headache, malaise)
  • prodromal symptoms in 50% of patients before appearance of lesions (mild burning, itching or tingling)
  • symptoms are less severe in recurrent disease
45
Q

Diagnosis of genital herpes

A
  1. Virologic tests (viral cell culture and NAAT/PCR)

2. Type specific serologic tests (takes 6-8 weeks for serological detection)

46
Q

Supportive care for genital herpes

A
  • warm saline bath relieves discomfort
  • good genital hygiene to prevent superinfection
  • counselling regarding natural history of genital herpes (cannot be cured)
47
Q

Treatment for genital herpes (Initial episode)

A

maximum benefit if within 72h
1. PO Acyclovir 400mg TDS x 7-10 days
2. IV Acyclovir 5-10mg/kg q8h x 7-10 days (severe disease or complications req hospitalisation)
3. PO Valacyclovir 1g BD x 7-10 days
treatment can be extended if healing is incomplete after 10 days

48
Q

Counselling for Acyclovir / Valacyclovir

A
  • headache

- hydration to prevent crystallisation in renal tubules

49
Q

Treatment for recurrent genital herpes (chronic suppressive therapy)

A
  1. PO Acyclovir 400mg BD
  2. PO Valacyclovir 1g OD
  3. PO Valacyclovir 500mg OD (if <10 flares/year)
50
Q

Treatment for recurrent genital herpes (episodic treatment)

A
  1. PO Acyclovir 800mg TDS x 2 days
  2. PO Acyclovir 800mg BD x 5 days
  3. PO Valacyclovir 1g OD x 5 days
  4. PO Valacyclovir 500mg BD x 3 days
51
Q

Counselling for genital herpes

A
  • reduce risk of HSV transmission by chronic suppressive therapy and correct use of latex condoms
  • increased risk of HIV infection
52
Q

Management of sex partner (genital herpes)

A
  • symptomatic sex partner should be evaluated and treated in the same manner
  • asymptomatic sex partners should be questioned concerning histories of genital herpes and type-specific serological testing for HSV2

PR3124 (6 decks)

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