BRUSSELS, June 10 (Reuters) - The EU will sign a contract on Tuesday to secure over 40 million doses of a preventative avian flu vaccine for 15 countries with the first shipments heading to Finland, EU officials said on Monday.

The deal secures up to 665,000 doses from vaccine manufacturer CSL Seqirus and includes an option for a further 40 million vaccines for a maximum of four years. The vaccines will be jointly procured by the Commission's emergency health arm HERA and 15 countries in the EU and the European Economic Area.

The doses are intended for those most exposed to the virus, such as poultry farm workers and veterinarians. The United States, Canada and Britain are also in the process of securing preventative vaccine doses.

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