Healthy volunteers (male and female) aged 18-59 years were enrolled into the study by signing subject information leaflet and informed consent form. After screening them, subjects complying with inclusion and exclusion criteria were included in the study, randomised and vaccinated with one of the investigational medicinal products assigned by the randomisation list.~Subjects were observed for thirty (30) minutes after vaccination for any immediate reactions. All adverse events (AEs) were collected from the enrolment to Day 21-28. Safety data between Day 0 and Day 7-9 were documented on a Diary card by each subject. Safety assessment were performed based on Day 7-9 and Day 21-28 safety data compared to the baseline on Day 0.~Blood samples for immunogenicity assays were collected immediately before vaccination on Day 0 (pre-vaccination blood samples) and on Day 21-28 (post-vaccination blood samples) in all subjects included in the study and complying with the study procedures. Immunogenicity were evaluated by hemagglutinin inhibition test in order to assess immune response 3-4 weeks after vaccination.~The assessment of safety and immunogenicity of 4Fluart ID 1 µg/0.1 ml QIV and 4Fluart ID 2 µg/0.1 ml QIV was performed in comparison to the authorised 3Fluart, i.e. 3Fluart intramuscular (IM) 6 µg/0.5 ml TIV.
The primary objective of the study is to evaluate the safe usability of the study drugs, i.e. 4Fluart ID 1 µg haemagglutinin (HA)/0.1 ml QIV and 4Fluart ID 2 µg haemagglutinin (HA)/0.1 ml QIV in terms of safety concerns emerged.~The secondary objective of the study is to further assess safety in terms of safety parameters, as well as to assess the immunogenicity of 4Fluart ID 1 µg haemagglutinin (HA)/0.1 ml QIV and 4Fluart ID 2 µg haemagglutinin (HA)/0.1 ml QIV in terms of immunogenicity parameters.