Finland plans to offer preemptive bird flu vaccination as soon as next week to some workers with exposure to animals, health authorities said on Tuesday, making it the first country in the world to do so.

The Nordic country has bought vaccines for 10,000 people, each consisting of two injections, as part of a joint EU procurement of up to 40 million doses for 15 nations from manufacturer CSL Seqirus (CSL.AX).

The European Commission said Finland would be the first country to roll out the vaccine.

“The vaccine will be offered to those aged 18 or over who are at increased risk of contracting avian influenza due to their work or other circumstances,” the Finnish Institute for Health and Welfare (THL) said in a statement.

The H5N1 strain of bird flu has killed or caused the culling of hundreds of millions of poultry globally in recent years and has increasingly been spreading to mammals, including cows in the United States and, in some cases, also to humans.