Den er fremstillet ved "rekombinant dna- teknik" (indsætning af gener i en organisme), således at den bærer antigenerne H5 (hæmagglutinin 5) og N3 (neuraminidase 3).
It has been made using a ‘ recombinant DNA technique’ (when genes are inserted into an organism) to carry the H5 (haemagglutinin 5) and N3 (neuraminidase 3) antigens.