tetano
Editor, Senior Moderator
Vaccine
. 2020 Jul 29;S0264-410X(20)30936-1.
doi: 10.1016/j.vaccine.2020.07.023. Online ahead of print.
A real-world study evaluating the relative vaccine effectiveness of a cell-based quadrivalent influenza vaccine compared to egg-based quadrivalent influenza vaccine in the US during the 2017-18 influenza season
Victoria Divino[SUP] 1 [/SUP], Girishanthy Krishnarajah[SUP] 2 [/SUP], Stephen I Pelton[SUP] 3 [/SUP], Joaquin Mould-Quevedo[SUP] 2 [/SUP], Vamshi Ruthwik Anupindi[SUP] 4 [/SUP], Mitch DeKoven[SUP] 4 [/SUP], Maarten J Postma[SUP] 5 [/SUP]
Affiliations
Abstract
Background: Cell-based influenza vaccine manufacturing reduces egg adaptations that can decrease vaccine effectiveness. We evaluated the relative vaccine effectiveness (rVE) of cell-based quadrivalent influenza vaccine (QIVc) compared to standard-dose egg-based quadrivalent influenza vaccines (QIVe-SD) against influenza-related and serious respiratory events among subjects 4-64 years of age during the 2017-18 influenza season.
Methods: A retrospective cohort analysis was conducted using administrative claims data in the US (IQVIA PharMetrics Plus? database). Subjects vaccinated with QIVc or QIVe-SD from 8/2017-1/2018 were identified (date of vaccination termed the index date). Influenza-related hospitalizations/ER visits, all-cause hospitalizations and serious respiratory hospitalizations/ER visits were assessed post-vaccination. Inverse probability of treatment weighting (IPTW) and Poisson regression were used to evaluate the adjusted rVE of QIVc compared to QIVe-SD. In a subgroup analysis, rVE was assessed for several subgroups of interest (4-17, 18-64 and 50-64 years, and subjects with ≥1 high-risk condition). In a secondary economic analysis, annualized all-cause costs over the follow-up were compared using propensity score matching (PSM) and generalized estimating equation (GEE) models.
Results: The study sample comprised 555,538 QIVc recipients and 2,528,524 QIVe-SD recipients. Prior to adjustment, QIVc subjects were older and had higher total costs in the 6-months pre-index. Following IPTW-adjustment and Poisson regression, QIVc was more effective in reducing influenza-related hospitalizations/ER visits, all-cause hospitalizations, and hospitalizations/ER visits related to asthma/COPD/bronchial events and other respiratory events compared to QIVe-SD. Similar trends were generally observed in the subgroup analysis. Following PSM adjustment and GEE regression, QIVe-SD was associated with significantly higher annualized all-cause total costs compared to QIVc, driven by higher costs for outpatient medical services and inpatient hospitalizations.
Conclusions: After adjustment for confounders and selection bias, QIVc reduced influenza-related hospitalizations/ER visits, all-cause hospitalizations, and serious respiratory hospitalizations/ER visits compared to QIVe-SD. QIVc was associated with significantly lower all-cause total costs.
Keywords: Cell-based influenza vaccine; Influenza; Influenza vaccine; Observational studies; Relative vaccine effectiveness; Retrospective studies.
. 2020 Jul 29;S0264-410X(20)30936-1.
doi: 10.1016/j.vaccine.2020.07.023. Online ahead of print.
A real-world study evaluating the relative vaccine effectiveness of a cell-based quadrivalent influenza vaccine compared to egg-based quadrivalent influenza vaccine in the US during the 2017-18 influenza season
Victoria Divino[SUP] 1 [/SUP], Girishanthy Krishnarajah[SUP] 2 [/SUP], Stephen I Pelton[SUP] 3 [/SUP], Joaquin Mould-Quevedo[SUP] 2 [/SUP], Vamshi Ruthwik Anupindi[SUP] 4 [/SUP], Mitch DeKoven[SUP] 4 [/SUP], Maarten J Postma[SUP] 5 [/SUP]
Affiliations
- PMID: 32739119
- DOI: 10.1016/j.vaccine.2020.07.023
Abstract
Background: Cell-based influenza vaccine manufacturing reduces egg adaptations that can decrease vaccine effectiveness. We evaluated the relative vaccine effectiveness (rVE) of cell-based quadrivalent influenza vaccine (QIVc) compared to standard-dose egg-based quadrivalent influenza vaccines (QIVe-SD) against influenza-related and serious respiratory events among subjects 4-64 years of age during the 2017-18 influenza season.
Methods: A retrospective cohort analysis was conducted using administrative claims data in the US (IQVIA PharMetrics Plus? database). Subjects vaccinated with QIVc or QIVe-SD from 8/2017-1/2018 were identified (date of vaccination termed the index date). Influenza-related hospitalizations/ER visits, all-cause hospitalizations and serious respiratory hospitalizations/ER visits were assessed post-vaccination. Inverse probability of treatment weighting (IPTW) and Poisson regression were used to evaluate the adjusted rVE of QIVc compared to QIVe-SD. In a subgroup analysis, rVE was assessed for several subgroups of interest (4-17, 18-64 and 50-64 years, and subjects with ≥1 high-risk condition). In a secondary economic analysis, annualized all-cause costs over the follow-up were compared using propensity score matching (PSM) and generalized estimating equation (GEE) models.
Results: The study sample comprised 555,538 QIVc recipients and 2,528,524 QIVe-SD recipients. Prior to adjustment, QIVc subjects were older and had higher total costs in the 6-months pre-index. Following IPTW-adjustment and Poisson regression, QIVc was more effective in reducing influenza-related hospitalizations/ER visits, all-cause hospitalizations, and hospitalizations/ER visits related to asthma/COPD/bronchial events and other respiratory events compared to QIVe-SD. Similar trends were generally observed in the subgroup analysis. Following PSM adjustment and GEE regression, QIVe-SD was associated with significantly higher annualized all-cause total costs compared to QIVc, driven by higher costs for outpatient medical services and inpatient hospitalizations.
Conclusions: After adjustment for confounders and selection bias, QIVc reduced influenza-related hospitalizations/ER visits, all-cause hospitalizations, and serious respiratory hospitalizations/ER visits compared to QIVe-SD. QIVc was associated with significantly lower all-cause total costs.
Keywords: Cell-based influenza vaccine; Influenza; Influenza vaccine; Observational studies; Relative vaccine effectiveness; Retrospective studies.