The Public Health Ministry's new travel advisory for Japan and Singapore is sparking concern among Thai tourists, many of whom are asking tour operators to refund their tickets.

The ministry on Tuesday advised people to delay travelling to Japan and Singapore while the two countries grapple with deadly coronavirus (Covid-19).

Those who cannot avoid visiting the two countries should take measures to protect themselves and prepare to be screened for the virus on their return.

Thai health authorities have extended coronavirus screening to cover visitors from Japan and Singapore after the countries reported local contagion cases.

Last year Thais paid more than 1.3 million visits to Japan, which scored high on their list of top destinations.

Authorities said that the virus outbreaks in Japan and Singapore had reached "Stage 3", of domestic transmission between locals with no record of meeting Chinese people. Thais who had visited the two countries in the past 14 days, and have fever or exhibit other symptoms, must visit a doctor and would receive treatment free of charge.

Since Feb 1, some 31,336 Thais have travelled via Don Mueang airport to Japan and 6,545 Thais to Singapore, the Immigration Bureau reported on Tuesday.

Charoen Wangananont, vice-president of the Thai Travel Agents Association, said a large number of Thais mistakenly believed the ministry had banned travel to Singapore and Japan.

"Actually, it simply urged the public to postpone their trips to at-risk destinations," he told the Bangkok Post on Tuesday.

Mr Charoen said even though travellers are cancelling their trips, airlines and tour operators cannot refund their customers because they are still operating normally.

"Since low-cost airlines are not refunding tickets, how can tour agents refund the money? Who will be responsible for damages? You can't let tour operators shoulder the financial burden," he said.

A tour operator who asked not to be named said 30% of her customers planning to visit Singapore and Japan have already asked for refunds after the ministry's announcement.