Thailand has added restrictions across Bangkok and other provinces as the reopening of Phuket for international tourists looms.
The government still plans to go ahead with reopening Pkuket to vaccinated foreign tourists to visit quarantine-free.
Thailand reported nearly 4,000 new cases.
In Bangkok restaurant service is allowed for takeaway only and all meetings and social events are cancelled.
Shopping centres in Bangkok can stay open until 9pm.
There are also curbs on travel between affected provinces.
Apisamai Srirangson, spokeswoman for the Centre for Covid-19 Situation Administration said the latest clusters are due to migrant workers leaving camps without permission.
They will be isolated in the camps
Prime Minister Prayuth Chan-ocha said the call for a seven-day curfew across Bangkok was rejected but the new measures could last for 30 days.
Less than 10% of the Thai population has been vaccinated with at least one jab.
