Thailand on Thursday reported its first case of community transmission of the novel coronavirus after 100 days with no detected local cases.
Health authorities said the case was detected in a recently jailed 37-year-old man, who tested positive during his 14-day quarantine period at the prison.
They said there was no record of his ever having traveled out of the country.
His close contacts considered to be at high risk, including family members, other inmates and Corrections Department staff, have been tested, but so far all results have been negative.
Thailand has had 3,427 cumulative cases, with 58 deaths.
Wednesday marked Thailand's 100th day free from local infection.