Two Thais and a German tourist are free of the influenza A/H1N1 according to laboratory tests, Witthaya Kaewparadai, Thai Minister of Public Health said on Wednesday.

The three were earlier quarantined at hospitals shortly after arriving at Thailand's Suvarnabhumi International Airport in Bangkok since they developed flu-like symptoms.

All of them were allowed to return home, said Witthaya, Thai language-news agency INN reported.

In a related development, Witthaya disclosed health ministers of the ASEAN member countries and China, Japan and South Korea have already confirmed participation in the health ministers' meeting on Thursday and Friday in capital Bangkok.

The meeting plans to brainstorm in finding precautionary measures to prevent the swine flu outbreak in the region.