Mouse Adapted SARS-CoV-2 protects animals from lethal SARS-CoV challenge.

Area of Science:

• Virology
• Immunology
• Pathology

Background:

• The COVID-19 pandemic caused by SARS-CoV-2 has had severe global health and economic impacts.
• Understanding SARS-CoV-2 pathogenesis is crucial, but limited by the lack of suitable animal models.
• Existing models do not fully recapitulate human disease, hindering research into viral mechanisms and therapeutic strategies.

Approach:

• Developed a mouse-adapted strain of SARS-CoV-2 using reverse genetics.
• Incorporated key mutations from SARS-CoV-2 variants to enhance disease modeling.
• Validated the model for viral replication in lungs, immune cell infiltration, and in vivo disease severity.

Key Points:

• The mouse-adapted SARS-CoV-2 replicates efficiently in mouse lungs and causes significant disease.
• This model maintains replication in human airway cells and similar antigenicity to human strains.
• Mice infected with the adapted strain showed protection against lethal challenge with the original SARS-CoV, indicating heterologous immunity.

Conclusions:

• This novel mouse model is a valuable tool for studying SARS-CoV-2 infection and COVID-19 pathogenesis.
• It facilitates research into viral mechanisms, immune responses, and the development of effective countermeasures.
• The model supports investigations into cross-protective immunity conferred by other coronavirus infections.