The Centre for Covid-19 Situation Administration (CCSA) reported 245 confirmed cases on Monday.
The cases included 14 people who had returned from Myanmar illegally (13 Thais and one Myanmar national).
Some of them had travelled to the neighbouring country for gambling and other purposes.
Of the 11 people testing positive in quarantine facilities, two Thais had flown back from the United Kingdom, two Thais from Switzerland, one each from Turkey, Bahrain and Denmark, as well as a Dutch man from Hungary, a British man from the United Arab Emirates, a Somalian man from Malaysia and an American man from his country.
Of the cases, 147 were exposed to the virus while visiting high-risk places. Provinces with two-digit cases include Samut Sakhon (37), Nonthaburi (31), Ang Thong (19), and Bangkok (36).
Proactive testing led to 48 positive cases being found — 43 in Samut Sakhon (two Thais and 41 migrant workers), four migrant workers in Nonthaburi, and one Thai in Bangkok,
In addition, the source of infection of 29 cases is still being sought, most of them found in Rayong (11) and Chonburi (12).
Meanwhile, 138 patients have recovered and been discharged.
The total number of confirmed cases in Thailand has increased to 10,547 – 8,381 of which were contracted domestically, including 2,839 from proactive testing, and 2,141 were returnees.
So far, 6,566 have recovered and been discharged, 3,914 patients are being treated in hospitals, while 67 have died.
According to Worldometer, as of Sunday midnight, the total number of confirmed cases globally had risen to 90.69 million (up by 612,214), 64.81 million have recovered, 23.93 million are active cases (108,541 in severe condition) and 1.94 million have died (up by 8,836).
Thailand ranks 128th on the global list of most cases, while the US tops the list with 22.91 million, followed by India 10.46 million, Brazil 8.1 million, Russia 3.4 million and the United Kingdom 3.07 million.