Influenza Clinical Trial
Official title:
Relative Vaccine Effectiveness of Adjuvanted Quadrivalent Inactivated Influenza Vaccine vs High-Dose Quadrivalent Inactivated Influenza Vaccine Among Adults ≥65 Years for the 2023-24 and 2024-25 Seasons
NCT number | NCT06029933 |
Other study ID # | 2033496 |
Secondary ID | |
Status | Recruiting |
Phase | |
First received | |
Last updated | |
Start date | August 17, 2023 |
Est. completion date | May 2026 |
This study will evaluate the relative vaccine effectiveness of quadrivalent adjuvanted inactivated influenza vaccine (aIIV4) versus quadrivalent high-dose inactivated influenza vaccine (HD-IIV4) in preventing polymerase chain reaction (PCR)-confirmed influenza and influenza-related outcomes in adults ≥65 years of age during the 2023/24 and 2024/25 influenza seasons. The study is an observational study conducted at Kaiser Permanente Northern California (KPNC), an integrated health care system in the United States.
Status | Recruiting |
Enrollment | 960000 |
Est. completion date | May 2026 |
Est. primary completion date | May 2025 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 65 Years and older |
Eligibility | Inclusion Criteria: - Age =65 years at the time of influenza vaccination - KPNC member at the time of vaccination - Receive either aIIV4 or HD-IIV4 at a KPNC facility during the 2023/24 and/or 2024/25 influenza seasons Exclusion Criteria: - Age <65 years at the time of influenza vaccination - Received either aIIV4 or HD-IIV4 in the inpatient setting - Receive more than one influenza vaccination during a single season period (i.e., 2023/24 or 2024/25 influenza seasons) - Receive an influenza vaccination outside of KPNC |
Country | Name | City | State |
---|---|---|---|
United States | Kaiser Permanente Northern California (entire region) | Oakland | California |
Lead Sponsor | Collaborator |
---|---|
Kaiser Permanente | Seqirus |
United States,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Other | Hospitalization for cardiovascular events | KPNC members =65 years who receive Fluad or Fluzone High-Dose will be retrospectively assessed for hospitalization for cardiovascular events. This outcome will be assessed in single-season analyses (2023/24 and 2024/25 separately) and a pooled 2-seasons analysis (2023/24 and 2024/25 combined). | =14 days after vaccination until date of outcome, death, loss-to-follow-up, or end of each season (estimated May 2024 or May 2025) | |
Other | PCR-confirmed influenza in subgroups with comorbidities | KPNC members =65 years with comorbidities (e.g., cardiovascular and respiratory conditions, diabetes, obesity) who receive Fluad or Fluzone High-Dose will be retrospectively assessed for hospitalization for PCR-confirmed influenza. This outcome will be assessed in a pooled 2-seasons analysis (2023/24 and 2024/25 combined). | =14 days after vaccination until date of outcome, death, loss-to-follow-up, or end of each season (estimated May 2024 or May 2025) | |
Primary | PCR-confirmed influenza | KPNC members =65 years who receive Fluad or Fluzone High-Dose will be retrospectively assessed for the presence of PCR-confirmed influenza. This outcome will be assessed in single-season analyses (2023/24 and 2024/25 separately) and a pooled 2-seasons analysis (2023/24 and 2024/25 combined). | =14 days after vaccination until date of outcome, death, loss-to-follow-up, or end of each season (estimated May 2024 or May 2025) | |
Secondary | Emergency department visit or hospitalization for PCR-confirmed influenza | KPNC members =65 years who receive Fluad or Fluzone High-Dose will be retrospectively assessed for an emergency department visit or hospitalization for PCR-confirmed influenza. This outcome will be assessed in single-season analyses (2023/24 and 2024/25 separately) and a pooled 2-seasons analysis (2023/24 and 2024/25 combined). | =14 days after vaccination until date of outcome, death, loss-to-follow-up, or end of each season (estimated May 2024 or May 2025) | |
Secondary | Hospitalization for PCR-confirmed influenza | KPNC members =65 years who receive Fluad or Fluzone High-Dose will be retrospectively assessed for hospitalization for PCR-confirmed influenza. This outcome will be assessed in a pooled 2-seasons analysis (2023/24 and 2024/25 combined). | =14 days after vaccination until date of outcome, death, loss-to-follow-up, or end of each season (estimated May 2024 or May 2025) | |
Secondary | Hospitalization for all-cause community-acquired pneumonia | KPNC members =65 years who receive Fluad or Fluzone High-Dose will be retrospectively assessed for hospitalization for all-cause community-acquired pneumonia. This outcome will be assessed in single-season analyses (2023/24 and 2024/25 separately) and a pooled 2-seasons analysis (2023/24 and 2024/25 combined). | =14 days after vaccination until date of outcome, death, loss-to-follow-up, or end of each season (estimated May 2024 or May 2025) |
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