Thailand confirmed 427 new coronavirus infections on Tuesday, with the majority of cases linked to a seafood centre outbreak in a province near the capital Bangkok, the public health ministry said.
The new cases include 397 migrant workers in the southwestern province of Samut Sakhon, where Thailand's coronavirus worst outbreak yet was confirmed at the weekend.
There were also 16 other local infections in several provinces which are linked to the same outbreak, plus 14 cases imported from abroad.
Meanwhile, India has recorded 19,556 new cases of the coronavirus, according to health ministry data on Tuesday, its lowest daily increase since July 3.
The new infections took India's total to 10.08 million, according to a Reuters tally.
Daily cases have been falling steadily in India since a peak in September, in spite of a busy festival season last month. India has recorded the world's second-highest number of infections, after the United States.
A total of 146,111 people have died of the coronavirus in India, with 301 deaths in the last 24 hours, the ministry said.