Two immigration officers at Bangkok's main airport have coronavirus and may have handled the passports of visitors to Thailand, a health official said according to AFP.

The men, both working at Suvarnabhumi airport, fell ill on March 7 and 8 respectively and potentially came into contact with arriving passengers in the days before their diagnosis.

One of the officers was among a team leading health screenings of Thai returnees from South Korea — which has reported the second most COVID-19 infections in Asia after China.

"They were not working at the same spots," Sopon Iamsirithaworn of the Disease Control Department said.

"There is a chance they came into contact with foreigners or touched passports," he added.