As every year, the winter season is synonymous of influenza viruses causing health problems and significant economic losses for public and private companies. One small, but not negligible, percentage will incur in complications and, potentially, there will also be an increase in mortality for new-borns and elderly patients, caused by the same virus. The vaccine against the seasonal influenza virus strain protects with an effectiveness estimated between 75 and 80 percent – therefore quite good – but not complete. Besides, the vaccination must be