The two markets had been ordered shut for cleaning and disinfection since February 9 after some Covid-19 cases were traced back there.
The provincial health office had undertaken proactive testing of nearly 20,000 people around the markets and nearby communities from February 9-24, and found 498 people positive for Covid-19, or 2.58 per cent of those tested.
“Most of the infected people showed no symptoms and were Thai merchants in markets and migrant workers,” said the office.
As of Thursday, Pathum Thani has reported a total of 522 patients, 262 are under hospitalisation and 260 have been cured with no fatality.