3 Adjuvated Reduced Dose IPV-Al SSI Vaccines and Non-adjuvated Full Dose IPV SSI, as Booster Vaccination to Adolescents

The trial is a phase I/II, parallel- and multi-group, randomised, controlled, multi-centre, non-inferiority trial investigating the safety and immunogenicity of 4 IPV vaccines, given as a booster vaccination to adolescents who have completed primary infant vaccination and pre-school booster vaccination with IPV in Denmark.

At Visit 1 (Screening and vaccination visit), written informed consent is obtained and the subject's eligibility is assessed according to the pre-specified in-/exclusion criteria, including measurement of oral temperature. If the subject is included, a pre-vaccination blood sample is taken for polio antibody determinations, and the subject is randomly allocated into one of the 4 groups to be vaccinated.

The subjects are observed for ½ an hour after the IMP injection and any immediate adverse events observed are to be recorded. A diary, thermometer and ruler are handed out to the subjects so that they can measure daily the injection site reactions and temperature the first 3 days (72 hours) and record any adverse event until the follow-up visit.

At Visit 2 (Follow-up visit), 28-35 days later, a post-vaccination blood sample is taken, the diary is collected, and adverse events and concomitant medications are recorded in the eCRF.

The trial is conducted in two parts. In the first part, 50 % of the subjects are randomised with allocation weights 4:4:1:1 to IPV SSI, 1/3 IPV-Al SSI, 1/5 IPV-Al SSI or 1/10 IPV-Al SSI, respectively. In the second part, the corresponding allocation weights are 1:1:4:4 for the remaining 50 % of the subjects.

After inclusion of 50 % of the subjects, an interim immunogenicity analysis is planned. While the interim analysis on 50% of the completed subjects is performed, the trial continues to recruit and randomise the remaining 50% of the subjects.

Inclusion criteria

• Adolescents from ≥ 10 to ≤ 15 years of age at inclusion
• Healthy assessed from medical history and oral temperature at inclusion
• Vaccinated in Denmark according to the current vaccination program of 3 IPV doses in infancy and one IPV dose at pre-school age (i.e. born ≥ 1 July 1999)
• Signed informed consent from adolescent's parent(s)/legal guardian(s)
• Grant of authorised person's access to adolescent's medical records from adolescent's parent(s)/legal guardian(s)
• Is willing and likely to comply with trial procedures

Exclusion criteria

• Vaccinated with IPV ≤ 5 years prior to inclusion
• Vaccinated with OPV any time prior to inclusion
• Travelled in wild polio virus endemic region ≤ 5 years prior to inclusion
• History of serious adverse reaction(s) after any previous vaccination
• Known or suspected allergy to active or inactive vaccine constituents
• Vaccinated with a live vaccine (e.g. measles, mumps, rubella, varicella, yellow fever or typhoid) ≤ 1 month prior to inclusion or during the trial. Subjects vaccinated with inactivated vaccines (e.g. tetanus, diphtheria, human papillomavirus, hepatitis A or B) are eligible for inclusion
• Known or suspected immunodeficiency (e.g. HIV, leukaemia, lymphoma)
• Severe uncontrolled disease (e.g. diabetes, asthma, epilepsy, heart or Crohn's disease). Patients in controlled medical treatment may be included, as assessed by the investigator
• In treatment with systemic corticosteroids given p.o., i.v., i.m. ≤ 1 month prior to inclusion or during the trial. Subjects administered corticosteroid topically or by asthma inhalators are eligible for inclusion
• In treatment with immune modulating products ≤ 3 months prior to inclusion or during the trial, e.g. blood products, immunoglobulins, cytostatics (e.g. methotrexate), TNF-antagonists (e.g. etanercerpt, infliximab, adalimumab, golimumab, certolizumab), or immunosuppressants (e.g. azathioprine or ciclosporin)
• In treatment with any investigational medicinal product ≤ 3 months prior to inclusion or during the trial
• A positive pregnancy test result at inclusion (for females who have had their first period) and/or objection to use contraception (for females who are sexually active)
• Is unsuitable for participation in the trial or is not likely to comply with instructions as assessed by the investigator