CSL's (ASX:CSL) shares inched higher in recent trading on Wednesday after it said on Tuesday that study data showed that relative vaccine effectiveness between adjuvanted quadrivalent influenza vaccines (aQIV) and high-dose quadrivalent influenza vaccines (HD-QIV) was comparable across all settings.
Findings were presented at the 10th European Scientific Working Group on Influenza conference in Valencia.
A test-negative design study in adults in the US aged 65 and above evaluated the relative effectiveness of aQIV versus HD-QIV in preventing influenza and related hospitalizations during the 2023 to 2024 season, including 37,377 vaccinated adults, with 3,174 testing positive for influenza.
A model-based analysis across Denmark, Sweden, Norway, and Finland evaluated the impact of extending enhanced influenza vaccine coverage to all adults aged 65 and older, which concluded that it would substantially reduce influenza-related doctor visits, emergency visits, and hospitalizations.