Animal models in influenza vaccine testing

Area of Science:

• Virology
• Immunology
• Vaccinology

Background:

• Pandemic threats from influenza A (H5N1, H2N2) necessitate novel vaccine development.
• Regulatory approval requires efficacy data, often relying on animal models due to limitations in human trials.
• A weight-of-evidence approach combines animal model protection data with clinical surrogate endpoints.

Purpose of the Study:

• To review animal models used in influenza vaccine development.
• To highlight the suitability of specific species for testing human influenza vaccines.

Main Methods:

• Review of scientific literature on influenza virus infection in various animal species.
• Focus on laboratory mice, ferrets, and macaques as primary models for vaccine evaluation.
• Discussion of the role of these animal models in providing surrogate efficacy data.

Main Results:

• Influenza A viruses infect multiple animal species, including mice, ferrets, and macaques.
• Mice, ferrets, and macaques serve as critical models for assessing influenza vaccine immunogenicity and protective efficacy.
• These models provide essential data for regulatory submissions in the absence of human efficacy trials.

Conclusions:

• Laboratory mice, ferrets, and macaques are indispensable for preclinical influenza vaccine assessment.
• Animal model data, alongside clinical surrogate endpoints, forms the basis for vaccine approval.
• Continued research utilizing these animal models is crucial for pandemic preparedness.