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New COVID-19 Variant NB.1.8.1: Cambodia Tightens Measures

The Ministry of Health calls for vigilance as the variant circulates in Asia. What you need to know in Siem Reap.

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Updated 2026-05-25 5 min

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In short

  • ●The Cambodian Ministry of Health has renewed its calls for preventive measures against COVID-19 following the spread of the NB.1.8.1 variant in Asia.
  • ●No cases have been officially reported in Cambodia, but vigilance is increased at entry points and healthcare facilities.
  • ●Expats in Siem Reap are advised to follow recommendations: vaccination, masks in enclosed spaces, and testing if symptoms appear.
  • ●Health authorities are monitoring the situation and may adjust measures if necessary.
NB.1.8.1
Variant
May 25, 2026
Alert Date
Asia (including Cambodia)
Affected Area
Ministry of Health
Source

Key Facts at a Glance

  • Variant NB.1.8.1. New Omicron sublineage detected in several Asian countries.
  • Ministry Call. The Cambodian Ministry of Health renewed prevention recommendations on May 25, 2026.
  • No Confirmed Cases in Cambodia. To date, no NB.1.8.1 cases have been officially reported in the country.
  • Enhanced Measures. Increased surveillance at entry points and hospitals.
  • Vaccination. The ministry reminds the importance of booster doses for vulnerable individuals.

How It Unfolded

The NB.1.8.1 variant was first identified in April 2026. Here are the key steps.

  1. April 2026: Detection of the NB.1.8.1 variant in several Southeast Asian countries.
  2. Mid-May 2026: WHO classifies NB.1.8.1 as a variant under monitoring.
  3. May 25, 2026: The Cambodian Ministry of Health issues a circular renewing preventive measures.
  4. Upcoming: Enhanced epidemiological monitoring; possible travel recommendations if the situation evolves.

Regional Breakdown

Although no cases are confirmed in Cambodia, here is the regional distribution of the NB.1.8.1 variant according to available data.

Country/RegionStatusDetails
ThailandConfirmed casesA few dozen cases, mainly in Bangkok
VietnamConfirmed casesSporadic cases in Ho Chi Minh City and Hanoi
LaosUnder surveillanceNo confirmed cases, heightened vigilance at borders
CambodiaNo casesEnhanced surveillance, no reported cases
Other Asian countriesIsolated casesReported in Indonesia, Malaysia, Singapore

What This Means for Siem Reap

  • Masks recommended in enclosed public places (supermarkets, public transport, clinics).
  • Healthcare facilities may require a COVID-19 test if symptoms are present.
  • No travel restrictions for now, but airport checks may be tightened.
  • Vulnerable expats (age, comorbidities) are advised to check their vaccination status and consider a booster dose.
  • Public gatherings are not restricted, but mask-wearing is encouraged at events.

How to Stay Safe

  1. Update your vaccination. Make sure you have received your booster if eligible.
  2. Wear a mask in enclosed spaces. Especially in supermarkets, public transport, and clinics.
  3. Wash your hands regularly. Use hand sanitizer after touching public surfaces.
  4. Monitor symptoms. Fever, cough, fatigue: if you show signs, take an antigen test available at pharmacies.
  5. Avoid crowds if you are vulnerable. Prefer outdoor activities and off-peak hours.
  6. Follow official announcements. Check Ministry of Health channels and local media for updates.
  7. Keep your vaccination documents up to date. Useful for border checks or travel.

Frequently asked questions

Is the NB.1.8.1 variant more dangerous than previous ones?
At this stage, WHO classifies it as a variant under monitoring. It appears more transmissible but not more virulent. Current vaccines remain effective against severe forms.
Are there travel restrictions to or from Cambodia?
No, no travel restrictions have been imposed. Health checks at airports may be strengthened (temperature checks, questionnaire).
Where can I get tested in Siem Reap?
Antigen tests are available at pharmacies and private clinics. Public hospitals also offer PCR tests with a prescription.
Do I need to wear a mask outdoors?
Mask-wearing is not mandatory outdoors, but it is recommended in crowded places (markets, festivals).
What should I do if I develop symptoms?
Stay home, wear a mask, take an antigen test. If positive, isolate yourself and contact a doctor. Mild cases can be managed at home.

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Siem Reap Hub

The community guide for expats and travelers in Siem Reap, Cambodia