Zika Virus Situation and Trends in Thailand, 2026

Abstract

Highlight

• Zika virus disease is a mosquito-borne viral disease transmitted primarily by infected Aedes Other modes of transmission include mother-to-child transmission during pregnancy, sexual transmission, blood transfusion, and organ transplantation.
• As of 25 July 2026, Thailand had reported 89 cumulative Zika virus disease cases from 24 provinces, corresponding to an incidence rate of 0.13 cases per 100,000 population. One laboratory-confirmed Zika virus infection was reported in a pregnant woman, while no cases of Congenital Zika Syndrome (CZS) or deaths had been reported. The number of reported cases began to increase in June but remained below the 5-year median and lower than that reported during the same period in 2025. As Thailand is currently in the rainy season, when the risk of Zika virus transmission increases, continued surveillance is warranted.
• Although the overall number of reported cases remains relatively low compared with other Aedes-borne diseases, Zika virus disease continues to be an important public health concern, particularly among pregnant women. Zika virus infection during pregnancy may result in Congenital Zika Syndrome (CZS) in the infant, including congenital microcephaly, developmental abnormalities, visual impairment, and hearing impairment, which may have long-term impacts on the child’s quality of life.
• Prevention and control of Zika virus disease rely on avoiding mosquito bites, implementing the “3 Clean-ups to Prevent 3 Diseases” strategy, continuously eliminating Aedes mosquito breeding sites through vector control activities, and preventing sexual transmission.