Dhaka: Thailand has detected its first Omicron case in a US citizen who had travelled to the country from Spain in late November, a health official said on December 6.

The confirmed case in the man, who had arrived on November 29, makes Thailand the 47th country to have found the new variant, Opas Karnkawinpong, Director-General of the Department of Disease Control, said while addressing a news conference.

"This first confirmed case of Omicron variant is a 35-year-old man who is a US citizen who lived in Spain for a year," Opas said adding that the patient had mild symptom.

Opas said health authorities were conducting further tests of people who had come into contact with the man, but said all contacts so far were low risk.

Thailand banned travellers from eight African countries including Botswana, Eswatini, Lesotho, Malawi, Mozambique, Namibia, South Africa and Zimbabwe at the start of December amid concerns about the Omicron variant.

Opas said authorities had also limited travel from other African countries and were monitoring for more potential cases among international travellers.