The avian influenza virus has been spreading rapidly in Europe, with several infected wild birds found in France. Due to the increasing infection pressure from migratory wildlife and the spread of the virus in neighboring countries, the risk level for avian flu in the French metropolitan territory will be raised from "negligible" to "moderate". The French government has made vaccination against avian flu compulsory in farms with over 250 ducks, as ducks have been identified as a vector for the virus.