Thai health authorities are closely monitoring a rise in hepatitis A cases, with particular concern over younger adults who may lack immunity to the virus. The situation has drawn attention from medical experts, including prominent virologist Dr. Yong Poovorawan, who has highlighted that individuals under 40 years old in Thailand may be especially vulnerable due to lower rates of natural exposure and vaccination in recent decades.
Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus (HAV). It is typically spread through ingestion of contaminated food or water, or close contact with an infected person. Even as the illness is usually mild and most people recover completely, it can cause severe symptoms in some cases, particularly among older adults or those with pre-existing liver conditions. Unlike hepatitis B and C, hepatitis A does not lead to chronic liver disease, but it can still result in significant illness and temporary disability.
According to the Department of Disease Control (DDC) under Thailand’s Ministry of Public Health, preventive measures remain the most effective strategy against outbreaks. The agency continues to emphasize the importance of food and water hygiene, summarizing its guidance with the simple rule: “cook it, boil it, peel it, or forget it.” Regular handwashing with soap, especially after using the bathroom and before handling food, is also strongly recommended.
In April 2025, the DDC’s Office of Disease Prevention and Control Zone 9 (ODPC9) issued a public reminder about hepatitis A prevention, urging the public to adhere to these basic hygiene practices. The advisory came amid ongoing efforts to track and respond to localized increases in reported cases across several provinces.
While specific case numbers from recent months have not been independently verified through official daily bulletins accessible at the time of writing, historical data from the DDC shows that Thailand typically records several hundred hepatitis A cases annually, with fluctuations often linked to seasonal patterns and localized outbreaks in communities with limited access to clean water or sanitation facilities.
Vaccination against hepatitis A is available in Thailand and is included in the national immunization program for certain high-risk groups, though it is not yet part of the routine childhood vaccine schedule for all children. The vaccine is highly effective, with two doses providing long-term protection. Health officials suggest that adults in high-risk occupations — such as food handlers, healthcare workers, and those traveling to areas with intermediate or high endemicity — should consider vaccination if they have not been previously infected or immunized.
Dr. Yong, director of the Center of Excellence in Clinical Virology at Chulalongkorn University, has frequently commented on infectious disease trends in Thailand through public briefings and social media. His recent remarks about the susceptibility of younger Thais to hepatitis A align with broader epidemiological observations: as improved sanitation reduces childhood exposure to HAV, the average age of infection increases, leaving a cohort of adolescents and young adults without immunity.
This shift in epidemiology means that while overall infection rates may decline, the risk of symptomatic outbreaks in older age groups can rise when the virus is introduced, since adults are more likely to experience noticeable symptoms than young children, who often have asymptomatic infections.
The Ministry of Public Health has not declared a national hepatitis A outbreak at this time, but regional offices continue to conduct surveillance and respond to clusters as they emerge. Public communication efforts focus on early recognition of symptoms — such as fatigue, nausea, abdominal pain, loss of appetite, and jaundice — and timely medical consultation.
For the most current information on hepatitis A in Thailand, the public is encouraged to consult official updates from the Department of Disease Control website or follow announcements from the Ministry of Public Health. These sources provide the latest guidance on prevention, testing, and treatment options.
As of now, no specific travel restrictions or food bans have been issued in relation to hepatitis A, and health authorities stress that the risk to the general population remains manageable with proper hygiene and awareness.
Stay informed, practice good hygiene, and consult healthcare providers if you suspect exposure or experience symptoms. Public health works best when communities stay vigilant and informed.