On-site teaching resumed at the Bangkok Metropolitan Administration's 109 secondary schools on Monday, with nearly all staff and students now vaccinated against Covid-19.
The BMA announcement said 96% of school employees and 80% of students had been inoculated against the disease.
Students returning to classes had to pass antigen tests first, and 10-20% would have more antigen tests later.
Disease control measures in place included body temperature screening and hand sanitiser gel. The number of students in each classroom was limited to 25, the BMA said.
At Matthayom Puranawas School in Watthana district, the students were divided into two groups who would alternate between on-site classes and learning at home.
All activities that would bring students together in a crowd were still suspended.
