The invention concerns nucleotides vaccines encoding influenza proteins with few or no glycosylation sites. Since these first introductions of pandemic influenzas the viruses have drifted, accumulating mutations at antigenic sites, but also the N-glycosylation pattern has changed during the drifted years, accumulating N-linked glycosylation sequons that help mask the antigenic sites for recognition by the host immune system. These “naked” initial haemagglutinins induce a broad cross reactivity against widely drifted influenza subtypes. The origin of the DNA or RNA can be both pandemic influenza strains, which codes for proteins which have a naturally low content of glycosylation sites and/or DNA or RNA from non-pandemic influenza strains where the nucleotides have been mutated or changed so it encodes for proteins with less or no glycosylation sites. The invention also discloses DNA or RNA encoding the haemagglutinin (HA) from pandemic influenza A, e.g. the 1918 H1N1 and/or the 1957 H2N2 and/or the 1968 H3N2 influenza A virus, optionally with the Neuraminidase (NA) and/or matrix protein (M) and/or the nucleoprotein (NP) from these pandemic influenza virus included, mixed together with DNA or RNA from non-pandemic influenza A as a vaccine against present day and future influenza A viruses.
