E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
Prevention of influenza infection in children 6 months through 35 months of age |
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E.1.1.1 | Medical condition in easily understood language |
Active immunisation of children 6 months through 35 months of age against Influenza infection
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E.1.1.2 | Therapeutic area | Diseases [C] - Virus Diseases [C02] |
MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 20.0 |
E.1.2 | Level | PT |
E.1.2 | Classification code | 10022000 |
E.1.2 | Term | Influenza |
E.1.2 | System Organ Class | 10021881 - Infections and infestations |
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E.1.3 | Condition being studied is a rare disease | No |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
To compare the clinical efficacy of QIV-HD to QIV-SD in participants 6 months through 35 months of age for the prevention of laboratory-confirmed influenza illness caused by any influenza A or B type |
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E.2.2 | Secondary objectives of the trial |
- To compare QIV-HD to QIV-SD: - in participants 6 months through 35 months of age for the prevention of laboratory-confirmed influenza illness caused by any influenza A or B type using a more stringent threshold - in participants 6 months through 35 months of age for the prevention of laboratory-confirmed protocol-defined influenza-like illness caused by viral strains similar to those contained in the vaccine. - in participants 6 months through 23 months of age for the prevention of laboratory-confirmed influenza illness caused by any influenza A or B types. - To compare HAI immune response of QIV-HD to QIV-SD in participants 6 months through 35 months of age - To describe the HAI, seroneutralization (SN), and anti-neuraminidase (NA) immune response - To describe the immune response to revaccination in Season 3 (Northern Hemisphere) - To describe the safety profile of each vaccine
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E.2.3 | Trial contains a sub-study | No |
E.3 | Principal inclusion criteria |
- Aged 6 through 35 months on the day of the first study visit - Informed consent form has been signed and dated by the parent(s) or guardian(s) and by an independent witness, if required by local regulations. - Participant and parent / guardian are able to attend all scheduled visits and to comply with all study procedures. - Covered by health insurance if required by local regulations. - For Season 3 Re-vaccination Cohort: eligible particpants must have been enrolled in the Season 1 (2021-2022 Northern Hemisphere season) immunogenicity subset and must have completed all study procedures (ie, blood draws and vaccinations) in Season 1.
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E.4 | Principal exclusion criteria |
- Participation at the time of study enrollment (or in the 4 weeks preceding the first study vaccination) or planned participation during the present study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure. - For all participants: Receipt of any vaccine in the 30 days preceding the first study vaccination. For participants in immunogenicity subset: Planned receipt of any vaccine before Visit 2 for participants receiving 1 dose of influenza vaccine or Visit 3 for participants receiving 2 doses of influenza vaccine. - Previous vaccination against influenza in the preceding 6 months with either the study vaccine or another influenza vaccine - Receipt of immune globulins, blood or blood-derived products in the past 3 months. - Known or suspected congenital or acquired immunodeficiency (eg, HIV); or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy, within the preceding 6 months; or long-term systemic corticosteroid therapy (prednisone or equivalent for more than 2 consecutive weeks within the past 3 months). - Known systemic hypersensitivity to any of the vaccine components, or history of a life-threatening reaction to the vaccines used in the study or to a vaccine containing any of the same substances. Exception: participants with an egg allergy are allowed to enroll in the study. - Thrombocytopenia, bleeding disorder, or receipt of anticoagulants that based on Investigator’s judgment contraindicate intramuscular vaccination - Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with study conduct or completion. - Moderate or severe acute illness/infection (according to investigator judgment) on the day of vaccination or febrile illness (temperature ≥ 38.0°C [≥ 100.4°F]). A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided. - Identified as natural or adopted child of the Investigator or employee with direct involvement in the proposed study. - Personal or family history of Guillain-Barre Syndrome. - Any condition that in the opinion of the Investigator would pose a health risk to the participant if enrolled or could interfere with the evaluation of the vaccine. - Personal history of clinically significant development delay (at the discretion of the Investigator), neurologic disorder, or seizure disorder. - For Season 3 (2022-2023 Northern Hemisphere) main cohort: participants who were enrolled in a previous study season are excluded from Season 3, with the exception of the Re-vaccination Cohort.
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E.5 End points |
E.5.1 | Primary end point(s) |
Number of participants with laboratory-confirmed influenza illness caused by any influenza viral types/subtypes, in association with a protocol-defined ILI : Laboratory-confirmed influenza is a positive influenza result on either PCR or viral. A protocol-defined ILI is occurrence of fever concurrently with protocol pre-defined clinical symptoms.
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
From 14 days after the first injection to 6 months after the last injection |
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E.5.2 | Secondary end point(s) |
Number of participants with ILI laboratory-confirmed as positive: 1 -for viral strains similar to those contained in the vaccine: Laboratoryconfirmed influenza is a positive influenza result on either polymerase chain reaction (PCR) or viral culture 2 -in participants aged 6 through 23 months for any influenza A or B type 3 -for any influenza A or B type, according to previous vaccination status 4 -for similar to those contained in the vaccine, according to previous vaccination status: Viral strains are deemed similar to one of the vaccine components according to genomic sequence and antigenicity testing of laboratory-confirmed isolate 5 -for any influenza A or B type, and associated with acute otitis media (AOM): AOM is based on clinical diagnosis 6 -for viral strains similar to those contained in the vaccine, and associated with AOM: Laboratory-confirmed influenza is a positive influenza result on either PCR or viral culture. AOM is based on clinical diagnosis 7 -any influenza A or B type, and associated with acute lower respiratory infection (ALRI): Laboratory-confirmed influenza is a positive influenza result on either PCR or viral culture 8 -viral strains similar to those contained in the vaccine, and associated with ALRI: Laboratory-confirmed influenza is a positive influenza result on either PCR or viral culture 1,2,3,4,5,6,7,8 : Laboratory-confirmed influenza is a positive influenza result on either PCR or viral culture
Number of participants with ILI PCR-confirmed as positive for: 9 -viral strains similar to those contained in the vaccine: PCR-confirmed influenza is a positive influenza result on PCR 10 -any influenza A or B types: PCR-confirmed influenza is a positive influenza result on PCR
Number of participants with ILI culture-confirmed as positive : 11 -for viral strains similar to those contained in the vaccine : Cultureconfirmed influenza is a positive influenza result on viral culture 12 -for any influenza A or B types: Culture-confirmed influenza is a positive influenza result on viral culture 13 -for any influenza A or B types and associated with hospitalization: Laboratory-confirmed influenza is a positive influenza result on either PCR or viral culture. 14 -for viral strains similar to those contained in the vaccine and associated with hospitalization: Laboratory-confirmed influenza is a positive influenza result on either PCR or viral culture 15 -GMT of influenza vaccine antibodies 16 -Number of participants with seroconversion or significant increase: Seroconversion for participants with a pre-vaccination titer < 10 (1/dil): post-injection titer ≥ 40 (1/dil) on 28 days after the last vaccination or significant increase for participants with a pre-vaccination titer ≥ 10 (1/dil): ≥ 4-fold increase from pre- to post-injection titer on 28 days after the last vaccination 17 -Number of participants with influenza vaccine antibody titer ≥ 10 (1/dilution [dil]) 18 -Influenza vaccine antibody titer ratio: Individual antibody titer ratio 28 days after the last vaccination /Day 0 19 -Participant with influenza vaccine antibody titer ≥ 40 (1/dil) 16,17,18,19 : Antibody titers are measured by HAI assay 20 -Influenza SN antibody titer 21 -Influenza SN antibody titer ratio: Ratio is calculated as fold increase in serum SN post-vaccination relative to Day 0 22 -Influenza SN antibody titer. Titers levels assessed are ≥ 20 (1/dil), ≥ 40 (1/dil), and ≥ 80 (1/dil) Increase of titer [post/pre] ≥2 and ≥ 4 20,21,22: Antibody titers are measured by the SN method 23 -Detectable influenza SN antibody titer 24 -Anti-NA immune response: same endpoints as SN but with ELLA method
Number of participants with: 25 -immediate adverse events: it includes unsolicited systemic adverse events occurring within 30 minutes after vaccination 26 -solicited injection site and systemic reactions : tenderness, erythema, swelling, induration, and bruising. Systemic reactions: fever, vomiting, crying abnormal, drowsiness, appetite lost, and irritability 27 -unsolicited adverse events: events other than solicited reactions 28 -serious adverse events 29 -adverse events of special interest 28,29 : collected throughout the study
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 : From 14 days to maximum 6 months after the last injection 15, 16, 17, 18, 19, 20, 24 : Day 0 and 28 days after the last vaccination 21, 22, 23 : 28 days after the last vaccination 25 : Within 30 minutes after vaccination 26 : Within 7 days after vaccination 27 : Within 28 days after vaccination 28, 29 : From Day 0 to Day 180
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E.6 and E.7 Scope of the trial |
E.6 | Scope of the trial |
E.6.1 | Diagnosis | No |
E.6.2 | Prophylaxis | Yes |
E.6.3 | Therapy | No |
E.6.4 | Safety | Yes |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | No |
E.6.7 | Pharmacodynamic | No |
E.6.8 | Bioequivalence | No |
E.6.9 | Dose response | No |
E.6.10 | Pharmacogenetic | No |
E.6.11 | Pharmacogenomic | No |
E.6.12 | Pharmacoeconomic | No |
E.6.13 | Others | Yes |
E.6.13.1 | Other scope of the trial description |
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E.7 | Trial type and phase |
E.7.1 | Human pharmacology (Phase I) | No |
E.7.1.1 | First administration to humans | No |
E.7.1.2 | Bioequivalence study | No |
E.7.1.3 | Other | No |
E.7.1.3.1 | Other trial type description | |
E.7.2 | Therapeutic exploratory (Phase II) | No |
E.7.3 | Therapeutic confirmatory (Phase III) | Yes |
E.7.4 | Therapeutic use (Phase IV) | No |
E.8 Design of the trial |
E.8.1 | Controlled | Yes |
E.8.1.1 | Randomised | Yes |
E.8.1.2 | Open | No |
E.8.1.3 | Single blind | No |
E.8.1.4 | Double blind | Yes |
E.8.1.5 | Parallel group | Yes |
E.8.1.6 | Cross over | No |
E.8.1.7 | Other | Yes |
E.8.1.7.1 | Other trial design description |
120 participants (subjects) from Season 1 will participate in Season 3. |
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E.8.2 | Comparator of controlled trial |
E.8.2.1 | Other medicinal product(s) | Yes |
E.8.2.2 | Placebo | No |
E.8.2.3 | Other | No |
E.8.2.4 | Number of treatment arms in the trial | 2 |
E.8.3 |
Will this trial be conducted at a single site globally?
| No |
E.8.4 | Will this trial be conducted at multiple sites globally? | Yes |
E.8.6 Trial involving sites outside the EEA |
E.8.6.2 | Trial being conducted completely outside of the EEA | No |
E.8.6.3 | Specify the countries outside of the EEA in which trial sites are planned |
Australia |
Brazil |
Chile |
Colombia |
Czech Republic |
Finland |
Germany |
Italy |
Mexico |
Philippines |
Poland |
South Africa |
Spain |
Taiwan |
United States |
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E.8.7 | Trial has a data monitoring committee | Yes |
E.8.8 |
Definition of the end of the trial and justification where it is not the last
visit of the last subject undergoing the trial
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Last contact of the last subject through telephone call 6 months after last vaccination |
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E.8.9 Initial estimate of the duration of the trial |
E.8.9.2 | In all countries concerned by the trial years | 3 |
E.8.9.2 | In all countries concerned by the trial months | 0 |
E.8.9.2 | In all countries concerned by the trial days | 0 |