Samut Sakhon stepped up preventive measures, declaring that the province is now a "quarantined area" from December 19 to January 3.
Various public venues such as sports stadiums, public parks and educational institutions are now closed. Restaurants have only a takeaway option and grocery shops must be closed from 10pm to 5am.
Samut Songkram announced a lockdown on Wednesday, which will stay in effect until January 4, resulting in a closure of public venues and the cancellation of New Year festivities.
Samut Prakan also has also gone into lockdown – from December 23 to January 4, closing public venues and cancelling all public events.
Chiang Mai has meanwhile clamped a lockdown in three subdistricts – Tha Ton, Malika and Mae Ai.