Statens Serum Institut (SSI) is a public enterprise under the Danish Ministry of Health. On behalf of the Ministry, SSI will conduct a procurement of a pandemic influenza vaccine. The purpose of this tender is to ensure the needed stock of influenza vaccines in the event of an influenza pandemic during the contract period. The contract (Advance Purchase Agreement) regards reservation of the supplier's production capacity and the contract will contain an option for delivery of pandemic influenza vaccine in the event of an influenza pandemic called by the WHO during the contract period. Denmark will need an option for delivery of up to 2 100 000 immunizations.