Herpes (HSV-1 & HSV-2) in Malaysia: Oral, Genital, Testing & Treatment
Herpes simplex virus (also called STD) comes in two types: HSV-1 (most often oral cold sores, but increasingly genital) and HSV-2 (predominantly genital). Both are lifelong. Around 80% of people with genital HSV are unaware they carry it, and the majority of HSV-1 carriers have never been tested. Diagnosis during an outbreak is by swab PCR; type-specific blood serology identifies past infection and distinguishes HSV-1 from HSV-2. Daily antiviral suppression reduces outbreaks and partner transmission by up to 50%.
Medically reviewed by Dr. Jasvinderpal Singh · MD, MMC-registered · Pathogen: Herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) · ICD-10 B00 (oral/skin HSV) and A60 (anogenital HSV)
What is herpes (hsv-1 & hsv-2)?
Herpes simplex virus (HSV) is a lifelong viral infection that causes recurrent painful blistering or ulcerating lesions. There are two types. HSV-1 has traditionally caused oral herpes (cold sores around the mouth) and is usually acquired in childhood through non-sexual skin contact - but it is now a rising cause of genital herpes via oral-to-genital transmission. HSV-2 is almost exclusively sexually transmitted and predominantly causes genital and anal herpes.
After the first outbreak the virus stays dormant in nerve ganglia (trigeminal for oral HSV, sacral for genital HSV) and reactivates intermittently throughout life. Antiviral therapy controls outbreaks and reduces transmission; there is no cure that eliminates the virus.
Most people with HSV are unaware of their status. Many "first outbreaks" are actually reactivations of an old, never-noticed infection.
Pathogen: Herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) (Enveloped DNA virus, Herpesviridae).
How it spreads
- Direct skin-to-skin contact with an infected area, with or without a visible lesion
- Vaginal, anal or oral sex with an infected partner
- Oral-to-genital transmission - HSV-1 from cold sores during oral sex is a growing cause of genital herpes
- Non-sexual skin contact in childhood (the most common HSV-1 acquisition route)
- Asymptomatic viral shedding - transmission can occur with no visible lesion
- Mother-to-baby during vaginal delivery if active genital lesions are present (neonatal herpes is severe)
- Not transmitted through toilet seats, towels, swimming pools or shared cutlery in normal circumstances
Who is at risk? Should I get tested?
- Anyone sexually active (genital HSV)
- Anyone with skin-to-skin contact, including in childhood (oral HSV-1)
- Multiple sexual partners
- Partner with known oral cold sores or genital herpes
- Immunocompromised individuals (more severe and frequent outbreaks)
- Women - biologically more efficient genital acquisition than men
- Receptive oral sex with a partner who has cold sores (HSV-1 to genital)
Should I get tested? Quick self-check
Answer the questions below - your concierge can advise on the next step.
- Have you had painful blisters, ulcers or sores on the genitals, anus or mouth?
- Have you had recurrent cold sores around the mouth or nose?
- Have you had a tingling, itching or burning sensation before a sore appears?
- Has a partner been diagnosed with genital herpes or cold sores?
- Have you had unexplained recurrent painful urination or genital discomfort?
- Have you had flu-like symptoms with a first oral or genital outbreak (fever, swollen lymph nodes)?
Symptoms
- Most infections (both HSV-1 and HSV-2) are silent or unrecognised
- Oral HSV-1: cold sores or blisters around the lips, nose or inside the mouth, usually preceded by tingling
- Genital HSV (HSV-1 or HSV-2) first outbreak: painful blisters or ulcers on the genitals or anus, fever, swollen lymph nodes, body aches (2-3 weeks)
- Recurrent outbreaks: tingling/burning prodrome, then a small cluster of painful blisters (3-7 days)
- Painful urination if genital lesions are near the urethra
- Rectal pain and discharge (anal herpes)
- Sore throat or ulcers in the throat (rare HSV-1 presentation)
Asymptomatic in men
Approximately 80% of people with genital HSV-2 are unaware they have it. Most HSV-1 carriers also never recognise the infection - either fully silent or with mild symptoms attributed to chapped lips or skin irritation.
Asymptomatic in women
Same - around 80% of HSV-2 infections are unrecognised. First outbreaks tend to be more severe in women than in men when they do occur.
Source: see reference [1] below.
Malaysia statistics
| Global seroprevalence of HSV-1 in adults under 50 (mostly oral, with rising genital share) | ~67% (~3.7 billion people, WHO 2016)[1] |
| Global seroprevalence of HSV-2 in adults aged 15-49 (genital) | ~13% (~491 million people, WHO 2016)[1] |
| Estimated HSV-2 seroprevalence in Malaysian/Southeast Asian adults | ~10-15%[2] |
| Herpes is not notifiable in Malaysia, so MOH does not publish nationwide case counts. | |
| Share of new genital herpes diagnoses attributable to HSV-1 (high-income settings) | ~50% and rising[1] |
| Neonatal herpes risk during primary maternal infection at delivery | Up to 40%[3] |
Testing & window period
Method
PCR swab of an active lesion (most sensitive). Type-specific HSV-1/HSV-2 IgG blood serology distinguishes past oral from past genital exposure when no active lesion is present.
Specimen
Swab of an active lesion (within the first 5 days); venous blood for type-specific serology
Window period
Lesion PCR is positive immediately during an outbreak. Type-specific antibodies develop over 2-12 weeks; we usually repeat serology at 12 weeks if an early test is negative and recent exposure is suspected.
Retest
Not routinely needed once the diagnosis is confirmed. Suppression therapy is reviewed every 12 months.
Treatment
First-line: Oral antiviral medication prescribed by our medical team. For a first episode, a short course taken ideally within 72 hours of symptom onset shortens the outbreak.
Alternative: For recurrent outbreaks, either episodic therapy (a short course taken at the onset of prodromal symptoms) or daily suppressive therapy (for frequent recurrences, or to reduce transmission to a partner) is offered. Topical antivirals have a limited role.
Partner management: Partners should be informed; type-specific serology is offered to confirm whether they are already seropositive. Daily suppressive antiviral therapy reduces partner transmission by around 50%.
There is no cure - antivirals control outbreaks and reduce shedding. Daily suppression reduces recurrence frequency by 70-80% and reduces asymptomatic viral shedding.
Follow-up
- Review at 1 month after a first episode to discuss suppression vs episodic therapy
- Annual review of suppressive therapy
- Antenatal review if pregnant - consider suppression in late pregnancy to reduce neonatal risk
- Screen for HIV and other STIs (herpes ulcers increase HIV acquisition risk)
Prevention
- Consistent condom use reduces but does not eliminate transmission
- Avoid sex (including oral) during outbreaks and prodrome
- Avoid oral sex when you or a partner has an active cold sore
- Daily antiviral suppression for the infected partner reduces transmission by around 50%
- Type-specific serology of partners to know status
- Caesarean delivery if active genital lesions are present at term
Vaccination
No licensed herpes vaccine yet. Several HSV vaccine candidates are in clinical trials.
See also: STI testing options, Antiviral STI treatment
Herpes (HSV-1 & HSV-2) - frequently asked questions
Clear answers, written by our clinical team. Tap any question for its direct permalink, or reach out to your Personal Concierge for anything else.
Both are herpes simplex viruses. HSV-1 has traditionally caused oral cold sores and is usually acquired in childhood through non-sexual skin contact. HSV-2 is almost exclusively sexually transmitted and predominantly causes genital herpes. Both types can infect either site, and HSV-1 is an increasingly common cause of genital herpes through oral-to-genital transmission.
Yes. Oral-to-genital transmission of HSV-1 (often from a partner with cold sores giving oral sex) now accounts for up to half of new genital herpes diagnoses in many high-income settings. HSV-1 genital recurrences tend to be milder and less frequent than HSV-2 genital recurrences.
Yes. The key risk is a first outbreak during pregnancy (particularly third trimester) or active genital lesions at delivery. Suppressive antivirals in late pregnancy reduce risk significantly, and caesarean delivery is offered if lesions are present at term.
Still have a question?
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References
- [1] World Health Organization. Herpes simplex virus - key facts (2023).
- [2] Looker KJ et al. Global and regional estimates of HSV-1 and HSV-2 prevalence, Bulletin of the WHO.
- [3] Centers for Disease Control and Prevention. Genital Herpes - CDC Treatment Guidelines (2021).
- [4] BASHH UK. Management of genital herpes guideline.
Other STI conditions
Browse our other in-depth STI guides - each covers symptoms, asymptomatic statistics by sex, Malaysia data, testing windows, treatment and prevention.
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