A man who drove migrant labourers to and from work has died after catching Covid-19, as the government reported 365 new infections.

His death raised the number of fatalities from the disease in Thailand to 66. The tally of confirmed cases had risen to 9,331 as of Wednesday.

Taweesilp Visanuyothin, the Centre for Covid-19 Situation Administration spokesman, said the latest fatality was a 63-year-old man who drove foreign labourers to their jobs and back to their accommodation in Samut Sakhon.

The man was admitted to a hospital in the province on Dec 27 and pronounced dead on Tuesday.

Of the 365 new cases, 250 were local infections and 99 were migrant workers, and the 16 others arrivals from overseas.

The CCSA said Chon Buri had the most new cases, followed by Samut Prakan, Chanthaburi and Bangkok.

Health officials working in Samut Sakhon were intent on stopping the spread of Covid-19 to other factories and houses of workers.

The province had more than 10,000 factories, most of them small with fewer than 100 employees. Surveys had revealed migrant workers staying in many locations, but largely in Muang district.

"We will go and check all those places," the spokesman said.