The European Union faces growing calls to deliver a coordinated strategy to combat bird flu.
France is the latest country to demand immediate action from the EU Commission, including increased monitoring of migratory birds and measures to protect farm-raised poultry.
Outbreaks of the diseaase at the weekend in Turkey and Romania have sparked fears that it could advance into western Europe.
Experts have not established whether the latest cases are from the H5N1 virus, which has killed millions of birds and dozens of people in Asia over the last two years.
Romania is culling thousands of farmyard birds in the Danube delta. Some residents are angry at what they call the arbitrary nature of the action.
“Last year the birds also died, including 70 of mine. No measures were taken. Why now ? It’s up to us if we want to eat them or not. The authorities have no right to do this,” one woman said.
Turkey has warned that it faces a high risk of further outbreaks as it lies along the path of many species of migrating birds.
In Bulgaria experts are testing samples from three dead birds found around 100 kilometres from the Romanian border.