Investigation and Control of a Hepatitis A Outbreak among Migrant Workers, Taoyuan City, 2022

Ching-Ting Yang^1*, Chia-Ping Su^2,3, Chia-Ying Yen1, Fang-Tzu Chang¹, Ji-Jia Huang¹, Kun-Bin Wu¹

2025 Vol.41 No.8

Correspondence Author： Ching-Ting Yang^1*

Abstract：

        During January 1 to March 31, 2022, 29 hepatitis A cases were reported among Thai workers in Taoyuan City. None had a travel history within two months. Epidemiological investigations revealed no overlap in infectious periods, with a single peak in onset dates, suggesting foodborne transmission. We conducted an outbreak investigation, including a case-control study, which showed that the consumption of raw beef (odds ratio: 3.85, 95% confidence interval: 1.47–10.04) was the most probable way of infection. Through cross-departmental collaboration, prevention and control actions such as epidemic investigation, post-exposure prophylaxis for contacts, and diversified health education and promotion were implemented. To prevent similar outbreaks, we recommend enhancing education on dietary hygiene, discouraging the consumption of raw food, and promoting hepatitis A vaccination for foreign workers prior to their entry into Taiwan.

Keywords：Hepatitis A, migrant workers, outbreak, post-exposure prophylaxis, hepatitis A vaccination