The lethal H5N1 strain of bird flu has been detected in Cameroon, making it the fourth African country to be hit by the virus.
A government statement said it had been found in a duck on a farm near the northern town of Maroua, on the border with Nigeria.
H5NI had previously been detected in poultry in Nigeria itself, Niger and also in Egypt.
Cameroon banned all imports of Nigerian poultry last month.
The tests from the farm near Maroua had been carried out in Paris, the Cameroonian government statement said.
No human cases of the H5N1 strain have yet been found in Africa.
But the United Nations has warned of a possible regional disaster if the disease continues to spread.