Programme of training: 1. Cell cultures, sub-cultivating, cryoconservation and recovery of cells. 2. Control of cell cultures for a contamination with mycoplasma. 3. Collection and transfer of clinical samples, biosecurity aspects. 4. Isolation of influenza viruses in different biological systems. 5. Identification of isolated viruses. 6. Antigenic analysis, HAI-test, microneutralization test. 7. Antigenic cartography of influenza viruses.