All three cases were asymptomatic and included a 53-year-old British engineer, who arrived from Qatar on October 21 and tested positive on October 24. He was in an alternative state quarantine hotel in Bangkok.
The second case was a 20-year-old US embassy employee, who had also arrived from Qatar on October 23 and tested positive on October 25 while quarantined in a Bangkok hotel.
The third case was a 19-year-old Sudanese medical student who had arrived from the United Arab Emirates on October 24 and tested positive on the same day while quarantined in a Bangkok hotel.
Meanwhile, eight patients have recovered and been discharged.
The total number of confirmed cases in Thailand has risen to 3,746 (798 in state quarantine), 136 of whom are in hospital and 3,551 have recovered. The death toll remains unchanged at 59.
According to Worldometer, as of 10am, the total number of confirmed cases worldwide has risen to 43.7 million (up by 411,372). Of them, 32.1 million have recovered, while 10.43 million are active cases (79,034 in severe condition) and 1.16 million have succumbed to the virus (up by 5,110).
Thailand ranks 146th for most cases in the world, while the US tops the list with 8.96 million, followed by India 7.94 million, Brazil 5.41 million, Russia 1.53 million and France 1.16 million.