Pfizer-BioNTech's combined mRNA vaccine for Covid-19 and influenza failed to demonstrate a robust immune response against the influenza B strain in Phase 3 trial.

Pfizer-BioNTech's combined mRNA vaccine for Covid-19 and influenza failed to meet one of its primary goals in a Phase 3 trial. While the experimental vaccine showed a robust immune response against the influenza A strain, it did not demonstrate a similar response against the less common influenza B strain. The combination vaccine's effectiveness against Covid-19 was comparable to that of Pfizer-BioNTech's standalone Covid-19 vaccine, Comirnaty. Pfizer and BioNTech are now considering modifications to improve the vaccine's performance against the influenza B strain and will discuss next steps with health authorities.

August 16, 2024
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