France has detected an outbreak of highly pathogenic avian influenza virus on a turkey farm in the northwest of the country, Reuters reported, citing the agriculture ministry on Tuesday. A seasonal wave of infections is currently spreading across Europe.

The outbreak in the Brittany region, France's first farm case this autumn, occurred near where an infected wild bird was found, the ministry said in a statement.

Several cases among wild birds have been recorded in recent days, it said, adding the government had raised its national alert level for bird flu to moderate from negligible.

Poultry flocks in areas particularly exposed to contact with wild birds would now be confined indoors, the ministry said.

Avian influenza, commonly known as bird flu, has led to the culling of hundreds of millions birds in the past years. It usually strikes in Europe during autumn and winter and has recently been detected on farms in countries including Germany, the Netherlands, Italy, Croatia and Hungary.

To counter the disease, which has disrupted the supply of poultry meat and eggs and sent prices rocketing in parts of the world in recent years, France launched a vaccination campaign against avian influenza in early October.

The French programme is being initially limited to ducks, which are the most vulnerable to the virus. Ducks accounted for only 8% of total French poultry output in 2022.