Injectable influenza vaccines
The influenza vaccines used in Finland contain components from three strains of viruses. The viruses for the vaccine have been grown in fertilised eggs, then purified, split and inactivated with formaldehyde. More information on the vaccines are available in the package leaflets, which can be found (in Finnish) in the FimeaWeb service.
The vaccines contain only parts of viruses, rather than whole ones. The vaccine will not give you influenza. The seasonal influenza vaccines included in the general vaccination programme contain no preservatives and no adjuvants to enhance the immune response.
The trade name of the injectable influenza vaccine supplied by the National Institute for Health and Welfare (THL) for the season 2016–2017 for all beginning from 6 months of age is Influvac. This recommendation has been issued by the national vaccine specialist group and THL.
The virus strains used in the vaccines are annually determined by the World Health Organization (WHO) and approved by the European Medicines Agency (EMA).
The virus strains used for season 2016-2017 injectable influenza vaccine Influvac are:
- A/California/7/2009 (H1N1)pdm09-like virus
- A/Hong Kong/4804/2014 (H3N2) –like virus
- B/Brisbane/60/2008 -like virus (Victoria-lineage)
Since last season, two virus strains (AH3N2 and B) have been replaced. The vaccine will also protect against the swine influenza.
Nasal spray vaccination
As part of the national vaccination programme, children aged 24 - 35 months may be given the Fluenz Tetra nasal spray instead of the injectable vaccine.
The virus strains in Fluenz Tetra in the 2016–2017 season are:
- A/California/7/2009 (H1N1)pdm09-like virus strain
- A/Hong Kong/4801/2014 (H3N2) -like virus strain
- B/Phuket/3037/2013 -like virus strain (Yamagata lineage)
- B/Brisbane/60/2008 -like virus strain (Victoria lineage)
The spray differs from the injection in that it contains two different influenza B virus strains and live attenuated viruses. The viruses in the vaccine have been weakened so that the vaccine cannot cause the influenza. When a person is given the vaccine, the immune system (the body's natural defence system) will produce its own protection against the influenza virus. The vaccine does not protect against common cold.
Prescription vaccinations are available under several different trade names in pharmacies. The virus strains in all of them meet the international recommendations, which are updated annually.
More information about influenza, vaccinations and the recommendations included in the national vaccination programme is available on the National Institute for Health and Welfare (THL) website. For the best coverage of the worldwide situation, please visit the WHO website.