Is it possible to stop bird flu coming into a country?

The fear, after the Turkish and Romanian findings, is that H5N1 will spread across Europe.

Because it is carried by birds, there is no way of preventing its spread.

But that does not mean it will be passed to domestic flocks. Experts say proper poultry controls - such as preventing wild birds getting in to poultry houses - which are present in the UK, should prevent that happening.

In addition, they say monitoring of the migratory patterns of wild birds should provide early alerts of the arrival of infected flocks - meaning they could be targeted on arrival.