Seqirus Co-Authors First Study to Assess Simultaneous Administration of Seasonal Influenza Vaccine and COVID-19 Vaccine Candidate

Seqirus, a global leader in influenza prevention and a division of CSL Limited (ASX: CSL), today announced that the company co-authored the first study to demonstrate the safety, immunogenicity and efficacy profile of a COVID-19 vaccine when co-administered with a seasonal influenza vaccine.1 The data is now available on medRxiv ahead of peer-review publication. The study was conducted by Novavax, Inc. as part of a Phase 3 clinical trial of NVX-CoV2373, its recombinant protein COVID-19 vaccine candidate, in the United Kingdom.1 The co-administration sub-study enrolled 431 volunteers, all of whom received either an adjuvanted, trivalent seasonal influenza vaccine (aTIV) or a cell-based, quadrivalent seasonal influenza vaccine (QIVc) provided by Seqirus.1 Approximately half of the volunteers also received NVX-CoV2373 while the remainder received the placebo. The study results suggest that efficacy of both the influenza vaccine and the COVID-19 vaccine candidate appeared to be preserved.1 No additional safety concerns were found with co-administration and adverse events were similar to the incidence and severity for each vaccine when administered separately.