Abstract: The object of the invention are monoclonal antibodies against hemagglutinin of H5-serotype influenza viruses selected from the group comprising G-1-31-22, G-2-14-10, G-5-32-5, G-6-42-42, G-7-24-17 and G-7-27-18, having a broad application in immunoprophylaxis and immunotherapy of infections evoked by H5-serotype influenza viruses in humans and animals. The invention also provides hybridomas producing said antibodies, as well as compositions and diagnostic kits containing said antibodies for the detection and typing of H5-serotype influenza viruses and antibodies against H5-serotype influenza viruses in biological samples.

Abstract: The invention relates to an influenza viruses hemagglutinin protein as a vaccine antigen against influenza viruses, in particular to a protein being a fragment of H5 hemagglutinin from highly pathogenic avian influenza virus (HPAIV) H5N1 strain, expressed in a bacterial expression system. The protein according to the invention is a potential ingredient of an anti-HPAIV H5N1 vaccine, administered to chickens parenterally or through mucous membranes in the presence of adjuvants. The object of the invention is also a method of obtaining the vaccine protein.

Abstract: The object of the invention is a DNA vaccine, method of inducing the immune response, antibodies specifically recognizing the haemagglutinin H5 of an influenza virus and application of the DNA vaccine. According to the invention, one or two-fold immunization of hens with DNA vaccine containing a cDNA encoding the modified H5 haemagglutinin HA protein, i.e. with the deletion of the cleavage site between HA subunits (this provides for greater safety of the vaccines). Moreover, the encoding region of the HA is modified in such a way that protein production in the bird cells should achieve maximal yield. The main modification is codon optimization for the hens and deletion of the site of proteolytic cleavage between subunits HA1 and HA2.