Thailand Updates Mpox Situation: Clade Ib Now Dominant, Health Officials Highlight Varied Symptoms

Thailand's Department of Disease Control reports that Mpox Clade Ib has become the predominant strain in the country, while emphasizing that symptoms may resemble other illnesses and no widespread transmission has been detected among the general population.

Thailand's Department of Disease Control (DDC), under the Ministry of Public Health, has provided an update on the country's mpox situation following social media reports suggesting that patients are presenting with symptoms different from those commonly associated with the disease.

Health officials clarified that mpox can cause a wide range of symptoms depending on the location of lesions, including symptoms that resemble tonsillitis or localized abscesses.

The department also confirmed that Mpox Clade Ib has become the predominant strain detected in Thailand, replacing Clade IIb, which had been the main strain circulating since the global outbreak began in 2022.

Despite the shift in strain distribution, health authorities reported no evidence of widespread Clade Ib transmission in the general population.

Mpox Symptoms May Resemble Tonsillitis or Other Infections

Dr. Montien Kanasawat, Director-General of Thailand's Department of Disease Control, explained that mpox can present with different symptoms depending on the affected area of the body.

According to information from the World Health Organization (WHO) and epidemiological surveillance, mpox lesions may appear on the skin or mucous membranes, including the:

• Genital area

• Anus and surrounding skin

• Mouth and throat

• Face

• Arms and legs

• Other sensitive mucosal tissues

Symptoms may include skin rashes, blisters, sores, fever, sore throat, anal pain, and inflammation of mucosal tissues.

In some patients, the disease may initially resemble a respiratory infection, tonsillitis, or a localized abscess.

Importantly, some individuals may have few visible lesions or no clearly noticeable rash during the early stages of illness.

Health officials therefore encourage medical professionals to consider mpox when assessing patients with compatible symptoms and relevant exposure histories, even when typical skin lesions are not obvious.

Mpox Clade Ib Becomes the Predominant Strain in Thailand

Thailand's epidemiological surveillance and laboratory testing previously identified Clade IIb as the main circulating mpox strain.

This was the same strain associated with the international mpox outbreak that began in 2022.

However, beginning in mid-2026, health authorities observed an increasing number of Clade Ib infections.

According to the Department of Disease Control, Clade Ib has now become the predominant strain detected in Thailand.

The department reported a case fatality rate of less than 0.5% for this strain in the context of its surveillance findings.

Nevertheless, officials warned that mpox can still cause significant illness, particularly among people with weakened immune systems or underlying medical conditions that are not adequately managed.

Severe complications may occur, making early diagnosis and appropriate medical care important.

Where Are Mpox Cases Being Detected in Thailand?

The Department of Disease Control reported that Clade Ib infections have been identified in several parts of the country.

Cases have been detected in major cities, tourism destinations, and densely populated provinces, as well as sporadically in other areas.

However, authorities stated that there is currently no indication of widespread Clade Ib transmission across the general population.

Most reported patients have been men aged 18–49 years.

Identified exposure circumstances have included close contact associated with sexual activity, social gatherings involving infected individuals, and household contact.

Health officials emphasized the importance of providing accurate information without stigmatizing affected individuals or communities.

How Does Mpox Spread?

Dr. Niti Hetanurak, Deputy Director-General of the Department of Disease Control, explained that mpox primarily spreads through direct and close contact with an infected person.

Potential transmission routes include:

• Direct contact with skin lesions: Touching mpox rashes, blisters, pustules, or sores.

• Close physical or sexual contact: Prolonged skin-to-skin contact with an infected person.

• Contaminated personal items: Sharing clothing, towels, or other materials contaminated with infectious secretions.

• Prolonged close-range respiratory exposure: Exposure to infectious respiratory particles during extended face-to-face contact.

Mpox is not typically transmitted through ordinary casual interactions without close exposure.

Understanding how the virus spreads can help individuals take appropriate precautions while avoiding unnecessary fear or discrimination.

What Should You Do If You Suspect Mpox?

People who develop symptoms compatible with mpox or believe they may have been exposed should seek medical assessment promptly.

While waiting for medical evaluation or test results, the Department of Disease Control recommends several precautions.

1. Avoid Close Contact with Others

Limit physical contact and avoid sexual activity until a healthcare professional has assessed the situation.

2. Cover Skin Lesions

Keep any visible sores or lesions covered where practical to reduce the risk of direct contact.

3. Practice Regular Hand Hygiene

Wash hands frequently with soap and water or use an appropriate alcohol-based hand sanitizer, such as one containing 70% alcohol.

4. Wear a Well-Fitting Face Mask

Wear a properly fitted mask when contact with other people cannot be avoided, particularly while seeking medical care.

5. Seek Medical Advice and Follow Testing Recommendations

Contact a healthcare provider for guidance on examination, testing, and appropriate management.

Early medical assessment can help identify the cause of symptoms and reduce the risk of further transmission.

Do All Mpox Patients Need Hospitalization?

According to Thailand's Department of Disease Control, not every person diagnosed with mpox requires hospital admission.

Healthcare professionals assess the need for hospitalization based on factors such as:

• Severity of symptoms

• Risk of complications

• Underlying medical conditions

• Ability to isolate safely at home

• Access to appropriate medical follow-up

Patients who are suitable for home isolation should follow their healthcare provider's instructions carefully.

Recommended measures include avoiding travel, limiting contact with others, using separate personal items, and cleaning clothing and frequently used belongings appropriately.

Isolation should continue until all skin lesions have healed, scabs have fallen off, new skin has formed, and any mucosal lesions have healed.

Patients should not end isolation solely because fever or other early symptoms have improved.

Thailand Urges Public Awareness Without Stigma

The Department of Disease Control emphasized that people with suspected mpox symptoms or relevant exposure risks should seek medical attention without delay.

Authorities also called on the public to avoid discrimination, respect patient privacy, and support equal access to healthcare services.

Accurate information about transmission is essential to reducing unnecessary fear and encouraging timely diagnosis.

Although mpox can cause serious illness, it generally requires close exposure to an infected person or contaminated materials rather than routine casual contact.

People experiencing suspected symptoms should avoid close contact with others and seek medical advice rather than attempting to diagnose the condition based on appearance alone.

Conclusion: Early Recognition and Prevention Remain Essential

Thailand's latest mpox update highlights two important developments: the increasing predominance of Clade Ib and the need to recognize that mpox symptoms may vary considerably between patients.

While some individuals develop characteristic skin lesions, others may initially experience symptoms resembling tonsillitis, anal inflammation, or other localized infections.

The Department of Disease Control continues to monitor the situation and reports no evidence of widespread transmission in the general population.

Early medical assessment, appropriate isolation, close-contact precautions, and accurate public information remain central to preventing mpox transmission in Thailand.

 

Reference :

Thailand Department of Disease Control  Mpox Symptoms May Vary, While Clade Ib Becomes the Predominant Strain in Thailand

Source: Department of Disease Control, Ministry of Public Health, Thailand. November 9, 2026.