Sixteen Chinese nationals were arrested for illegally entering the country along the Thai-Lao border in Nong Khai.
The navy said the group was arrested on Saturday night along the banks of the Mekong River.
The Chinese nationals were spotted and arrested by officials patrolling the river.
Officials suspected they were trying to avoid the 14-day quarantine.
None of those arrested had any identification documents with them.
Also, in Prachuap Khiri Khan yesterday, five Myanmar nationals were caught sneaking into Thailand in tambon Huai Sai.
Three of the men said they paid migrant smugglers 20,000 baht each to take them to an employer in Samut Sakhon.
