Another 836 cases of coronavirus infection were reported on Tuesday, bringing the confirmed caseload since the start of the pandemic a year ago to 20,618.
Two more deaths were also reported, both elderly people, increasing the total to 79.
The 836 new cases included 819 domestic transmissions, with 710 of those found through active testing. There were 17 imported cases.
Taweesilp Visanuyothin, spokesman for the Centre for Covid-19 Situation Administration, said the first new death was a 75-year-old Thai woman in Samut Sakhon province. She had also suffered from hypertension and high cholesterol.
On Jan 25 she sought a Covid-19 test because her husband was confirmed with the disease. She was asymptomatic and waited for her test result at home.
The test result was returned positive last Thursday, when she also suffered from exhaustion and shortness of breath, Dr Taweesilp said.
She was admitted to Samut Sakhon Hospital. Her condition deteriorated and she died on Saturday.
The other death was a Thai male vendor, 68, who further had suffered from diabetes and kidney failure.
Of the 836 new cases, 710 were confirmed through active case finding in communities and another 109 at hospitals.
Of the 710 cases found with active testing, 688 were in Samut Sakhon and comprised 629 Myanmar migrants and 59 Thais.
The 17 imported cases were quarantined arrivals from Switzerland (3), India (1), Nigeria (1), the United States (2), France (1), the United Kingdom (3), Denmark (1), Canada (2) and Malaysia (3).
