A new case of avian influenza has been confirmed in Thailand.

A laboratory test confirmed the case in a poultry sample in the northern province of Chiang Rai, reported the Chicago Tribune. This was confirmed by deputy agriculture minister Newin Chidchob.

The news calls into question Thailand’s declaration on Monday that it was free of bird flu. The World Health Organisation had previously called on countries affected by the virus not to issue premature declarations that they had eradicated the disease.