The new cases included two foreigners.
A 42-year-old Bangladeshi man travelled from his country on September 2 and tested positive on the second test at an alternative state quarantine hotel in Bangkok on September 15.
A 10-year-old Pakistani boy, who had travelled from his country on September 13, was found positive on September 16.
Three Thai returnees from Saudi Arabia --- two female students aged 9 and 14, and a 61-year-old man --- tested positive in state quarantine in Bangkok. They had a runny nose and had lost their sense of smell.
A 41-year-old Thai man returned from Qatar on September 13 (one passenger was earlier found to be infected on the same flight) and was found positive on September 16 in state quarantine in Chonburi province.
Meanwhile, a 50-year-old Thai man who had travelled from Saudi Arabia on September 5 and was in state quarantine in Bangkok, was found positive after the second test on September 16. He had been previously infected with Covid-19 in July.
Meanwhile, three patients recovered and were discharged from hospital.
The total number of confirmed cases in Thailand increased to 3,497 (559 in state quarantine), of whom 111 are in hospital and 3,328 have recovered and been discharged, while the death toll remains 58.
According to Worldometer, as of 10 am on Friday, the total number of confirmed global cases increased to 30.34 million (increasing by 316,058 over a 24-hour period), 22 million have recovered, 61,143 are in serious condition and 950,545 have died.
Thailand is 130th for most cases in the world, while the US has the most number with 6.87 million, followed by India 5.21 million, Brazil 4.45 million, Russia 1.08 million and Peru 750,098