The four Thais who returned from Wuhan and were hospitalised with a fever have all recovered, but one still requires treatment for a lung disorder.
The director of Queen Sirikit Hospital in Chon Buri province said on Thursday that four returnees had been admitted with a fever, coughing and diarrhoea and their symptoms had now subsided.
However, x-rays revealed one of them had a small lung disorder.
Initial tests did not find any novel coronavirus infection. The tests would be repeated.
The other 134 returnees are at the Sattahip naval base in Chon Buri.
Dr Suthep Phetmak, an inspector-general of the Public Health Department, said they remained healthy. Three of them had developed symptoms of tension and anxiety and had received counselling and medication.
Their phones has been decontaminated, so they could use them to contact friends and relatives.
Dr Tanarak Plipat, deputy director-general of the Disease Control Department, said the number of infections detected in Thailand remained at 25. Nine had been discharged from hospitals. The number of patients being monitored for infection had risen to 595.
"Transmission inside the country is still limited, as in many other countries. There is still a chance of finding visitors with symptoms, and people in contact with them," he said.
"In summary, Thai people have a very low risk of contracting the virus. I recommend frequent hand washing and the use of face masks," Dr Tanarak said.
