Although people are not prohibited from traveling, they have been urged not to travel during this time for the sake of public health.
It is the fifth straight day that the total number of cases rose by a 100 or more patients.
The Bank of Thailand and other financial institutions said on Wednesday they would keep as many branches open as possible to ensure business can continue during the Covid-19 emergency
Here is the unofficial translation of the statement by the Prime Minister.
The measure has been approved by the cabinet and can be extended if necessary.
The emergency decree gives the Prime Minister wide-ranging powers to use as he deems appropriate,
He said it will take effect starting Thursday and lasting one month.