Study of Shenzhen Quadrivalent Inactivated Influenza Vaccine Versus the Shenzhen Trivalent Inactivated Influenza Vaccine in Chinese Subjects From 6 Months of Age

Study Overview
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Brief Summary
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The primary objectives of the study were: To demonstrate the non-inferiority of the immune response in terms of geometric mean titers (GMTs) and seroconversion rates of the SP Shz QIV compared with the SP Shz TIV containing the Victoria lineage strain (TIV1) and the SP Shz TIV containing the Yamagata lineage strain (TIV2) for each strain To describe the safety profile of each dosage of SP Shz QIV, TIV1 or TIV2 The secondary objectives of the study were: Group 1 (subjects 6-35 months): To demonstrate the superiority of the immune response of SP Shz QIV compared to TIV2 or TIV1 group after the last dose; demonstrate the superiority of the immune response of the 0.5 mL dose of SP Shz QIV compared to 0.25 mL dose of SP Shz QIV group after the last dose; describe the immune response after administration of the last dose of either SP Shz QIV or SP Shz TIV1 or SP Shz TIV2. Groups 2 through 5 (subjects ≥ 3 years): To demonstrate the superiority of the immune response of SP Shz QIV compared to TIV2 or TIV1 group after a single dose; describe the immune response after each and every dose for all subjects ≥ 3 years of either SP Shz QIV or SP Shz TIV1 or SP Shz TIV2 Group 2 (subjects 3 to 8 years), previously unvaccinated ,receiving SP Shz QIV: To describe the immune response after administration of each dose of SP Shz QIV, first dose and second dose of SP Shz QIV respectively Group 5 (subjects ≥ 65 years only): To assess the compliance, in terms of immunogenicity, of SP Shz QIV with the requirements of the CHMP NfG CPMP/BWP/214/96 in subjects aged 65 years or older. To describe the safety profile of SP Shz QIV 0.5 mL after each dose.

Detailed Description
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Study duration per participants approximately is 180 days

Official Title
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Immunogenicity and Safety of the Shenzhen Quadrivalent Inactivated Influenza Vaccine Versus the Shenzhen Trivalent Inactivated Influenza Vaccine in Chinese Subjects From 6 Months of Age

Conditions
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Influenza

Intervention / Treatment
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* Biological: Quadrivalent Influenza Vaccine
* Biological: Trivalent Influenza Vaccine 1 SP Shz TIV1
* Biological: Trivalent Influenza Vaccine 2 SP Shz TIV2


Participation Criteria
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Eligibility Criteria
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Inclusion criteria : Aged ≥ 6 months on the day of the first study visit/inclusion In good health or with underlying medical condition(s) that are judged to be stable by the investigator. Medically-stable is defined as: No new diagnosis OR No new class of prescription drug initiated during the 3 months prior to enrollment For participants aged 6 months through 17 years: Informed consent form has been signed and dated by the parent(s) or another legally acceptable representative, if applicable. Additionally an assent form has been signed and dated by the subject if aged 8 through 17 years (based on local regulations). For subjects aged 18 years and above: Informed consent form has been signed and dated Subject / subject and parent/legally acceptable representative are able to attend all scheduled visits and to comply with all trial procedures For subjects aged 6 months to less than 12 months only: Born at full term of pregnancy (≥ 37 weeks) and with a birth weight ≥ 2.5 kg Exclusion criteria: Subject is pregnant, or lactating, or of childbearing potential and not using an effective method of contraception or abstinence from at least 4 weeks prior to vaccination until at least 4 weeks after vaccination. To be considered of non-childbearing potential, a female must be pre-menarche or post-menopausal for at least 1 year, or surgically sterile Participation at the time of study enrollment (or in the 4 weeks preceding the trial vaccination) or planned participation during the present trial period in another clinical trial investigating a vaccine, drug, medical device, or medical procedure Receipt of any vaccine or planned receipt of any vaccine within the period from 2 weeks before trial vaccination to 2 weeks following trial vaccination (or the last trial vaccination) For previously influenza vaccinated subjects: Previous vaccination against influenza (in the 2019-2020 season) with either the trial vaccine or another vaccine For previously influenza unvaccinated subjects: Any influenza vaccination (from birth to the day of inclusion) with either the trial vaccine or another vaccine Receipt of immune globulins, blood or blood-derived products in the past 3 months Known or suspected congenital or acquired immunodeficiency; 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 vaccine used in the trial or to a vaccine containing any of the same substances Self-reported thrombocytopenia or known thrombocytopenia as reported by the parent/legally acceptable representative, contraindicating intramuscular (IM) vaccination Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion, contraindicating IM vaccination Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily Current alcohol abuse or drug addiction Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with trial conduct or completion Personal history of clinically significant developmental delay (at the discretion of the Investigator), neurologic disorder, or seizure disorder Known seropositivity for human immunodeficiency virus, including known HIV carrier or patient Moderate or severe acute illness/infection (according to investigator judgment) on the day of vaccination or febrile illness (axillary temperature ≥ 37.1°C). A prospective subject should not be included in the study until the condition has resolved or the febrile event has subsided Personal history of Guillain-Barre syndrome Identified as an Investigator or employee of the Investigator or study center with direct involvement in the proposed study, or identified as an immediate family member (ie, parent, spouse, natural or adopted child) of the Investigator or employee with direct involvement in the proposed study

Ages Eligible for Study
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Minimum Age: 6 Months

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group A: 6 to 35 months, previously unvaccinated, step 1<br>Participants will receive two injections of SP Shz QIV 0.5 mL at Day 0 and Day 28 | Biological: Quadrivalent Influenza Vaccine<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>|
| Experimental: Group 1: 6 to 35 months, step 2<br>Participants will receive one injection of SP Shz QIV 0.25 mL or SP Shz QIV 0.5 mL at Day 0 or SP Shz TIV1 0.25 mL or SP Shz TIV2 0.25 mL at Day 0. Participants for whom 2 doses of influenza vaccine were recommended, a second dose was administered at Day 28. | Biological: Quadrivalent Influenza Vaccine<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 1 SP Shz TIV1<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 2 SP Shz TIV2<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>|
| Experimental: Group 2: 3 to 8 years, step 2<br>Participants will receive one injection of SP Shz QIV 0.5 mL or SP Shz QIV 0.5 mL or SP Shz TIV1 0.5 mL or SP Shz TIV2 0.5 mL at Day 0. Participants for whom 2 doses of influenza vaccine were recommended, a second dose was administered at Day 28. | Biological: Quadrivalent Influenza Vaccine<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 1 SP Shz TIV1<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 2 SP Shz TIV2<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>|
| Experimental: Group 3: 9 to 17 years, step 2<br>Participants will receive one injection of SP Shz QIV 0.5 mL or SP Shz TIV1 0.5 mL or SP Shz TIV2 0.5 mL at Day 0. | Biological: Quadrivalent Influenza Vaccine<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 1 SP Shz TIV1<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 2 SP Shz TIV2<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>|
| Experimental: Group 4: 18 to 60 years, step 2<br>Participants will receive one injection of SP Shz QIV 0.5 mL or SP Shz TIV1 0.5 mL or SP Shz TIV2 0.5 mL at Day 0. | Biological: Quadrivalent Influenza Vaccine<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 1 SP Shz TIV1<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 2 SP Shz TIV2<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>|
| Experimental: Group 5: >=61 years<br>Participants will receive one injection of SP Shz QIV 0.5 mL or SP Shz TIV1 0.5 mL or SP Shz TIV2 0.5 mL at Day 0. | Biological: Quadrivalent Influenza Vaccine<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 1 SP Shz TIV1<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>Biological: Trivalent Influenza Vaccine 2 SP Shz TIV2<br>* Pharmaceutical form: Suspension for injection Route of administration: intramuscular<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Geometric Mean Titers of Influenza Antibodies for Subjects 6-35 months | Geometric mean titers will be assessed by a hemagglutination (HAI) method | 28 days post-final vaccination | 
| Participants Achieving Seroconversion Against Antigens for Subjects 6-35 months | Influenza antibodies will be assessed using the HAI method. | 28 days post-final vaccination | 
| Geometric Mean Titers of Antibodies for Subjects ≥ 3 years | Geometric mean titers will be assessed by a HAI method | Day 28 | 
| Number of Participants Achieving Seroconversion Against Antigens for Subjects ≥ 3 years | Influenza antibodies will be assessed using the HAI method. | Day 28 | 
| Number of Participants with Immediate Adverse Events | Immediate adverse events includes unsolicited systemic adverse events occuring within 30 minutes after vaccination | Within 30 minutes after vaccination | 
| Number of Participants With Solicited Injection Site or Systemic Reactions | Injection site reactions: injection site tenderness/pain, erythema, swelling, induration, and ecchymosis. Systemic reactions: fever, vomiting, crying abnormal, drowsiness, appetite lost, and irritability for toddlers aged <= 23 months and fever, headache, malaise, myalgia and shivering for participants aged > 2 years. | Within 7 days after vaccination | 
| Number of Participants with Unsolicited Adverse Events | Adverse events other than solicited reactions | Within 28 days after vaccination | 
| Number of Participants with Serious Adverse Events | Serious adverse events (including adverse event of special interest) are assessed throughout the study. | From Day 0 to Day 56 for participants in Group A and from Day 0 to 6 months after last vaccination for participants in Group 1 through Group 5. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Geometric Mean Titers of Antibodies | Geometric mean titers will be assessed by a HAI method. | Day 0 and 28 days post-final vaccination | 
| Geometric Mean Individual Titer Ratio | Geometric mean titers will be assessed by a HAI method. | Day 0 and 28 days post-final vaccination | 
| Number of Participants with Detectable Titer ≥ 10 (1/dilution [1/dil]) | Geometric mean titers will be assessed by an HAI method. | Day 0 and 28 days post-final vaccination | 
| Percentage of Participants with Seroprotection to Antigens After Vaccination | Seroprotection was defined as antibody titer ≥ 40 (1/dil) on Day 0 and on 28 days post-final vaccination | Day 0 and 28 days post-final vaccination | 
| Percentage of Participants with Seroconversion to Antigens After Vaccination | Seroconversion titer < 10 (1/dil) on Day 0 and post-injection(s) titer ≥ 40 (1/dil) on Day 28 or Day 56, or titer ≥ 10 (1/dil) on Day 0 and ≥ 4-fold increase of post-injection(s) titer on 28 days post-final vaccination. | Day 0 and 28 days post-final vaccination | 
| Geometric Mean Individual Titer Ratio for Participants Aged 65 years or Older | Geometric mean titers will be assessed by an HAI method. | Day 0 and 28 days post-final vaccination | 
| Percentage of Participants with Seroconversion to Antigens After Vaccination for Participants Aged 65 years or Older | Seroconversion titer < 10 (1/dil) on Day 0 and post-injection(s) titer ≥ 40 (1/dil) on Day 28, or titer ≥ 10 (1/dil) on Day 0 and ≥ 4-fold increase of post-injection(s) titer on 28 days post-final vaccination. | Day 0 and 28 days post-final vaccination |