It comes a day after Sweden said tests showed two wild ducks found on its east coast carried H5N1.
Danish authorities have set up quarantine and surveillance zones around where the buzzard was found.
The Danish Institute for Food and Veterinary Research said on Thursday a sample from the tests on the buzzard would be sent to the EU laboratory in the UK for final verification.
But it confirmed in a statement the H5N1 virus had been found.
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