A hotel in Chanthaburi province, eastern Thailand, has been closed after a guest tested positive for Covid-19 following an explosion of cases linked to a seafood market.

More than 100 people from Samut Sakhon province - where thousands of Burmese workers have contracted the virus - stayed at the property for a wedding.

Footage from the hotel on Monday (December 21) shows officials in protective suits spraying disinfecting liquid over the hotel dining hall and elevators.

The outbreak happened at a fresh seafood market in Samut Sakhon province on the outskirts of Bangkok, where at least 821 workers have positive for the virus in recent days. Around 90 per cent of them were asymptomatic.

They are banned from leaving the compound and locals have had to deliver supplies of fresh food and water to them. There are believed to be more than 1,000 workers trapped inside the market area, which includes hundreds of shabby homes.

It came as several people in neighbouring areas tested positive following recent trips to the market, sparking fears of a second wave erupting in the country, which has largely kept the pandemic under control.

Deputy governor of the province, Surasak Polyangsong, said the first case was found last Thursday and since then, more than 2,000 people have been tested.

He said that an estimated 10,000 tests on people living and working in and around the market would be carried out using mobile labs this week.

Schools near Samut Sakhon have been ordered to shut while commuters between cities were advised to work from home. New Year events in the capital Bangkok have also been cancelled.

Thailand - which closed its borders in March and has enforced mask-wearing - has so far recorded 5,716 cases of coronavirus and 60 deaths.