Studies of SARS virus vaccines

Area of Science:

• Immunology
• Vaccinology
• Virology

Background:

• Severe Acute Respiratory Syndrome (SARS) poses a significant public health threat.
• Development of effective vaccines against SARS-CoV is crucial for pandemic preparedness.

Purpose of the Study:

• To evaluate the immunogenicity and protective efficacy of different SARS-CoV vaccine candidates.
• To compare the immune responses induced by various vaccination strategies and routes.

Main Methods:

• Assessment of systemic (serum IgG) and local (tracheal-lung IgA) antibody responses.
• Evaluation of neutralizing antibody activity and T-cell responses (Th1, Th2, CTL).
• Testing vaccine efficacy in animal models challenged with SARS-CoV.

Main Results:

• Intranasal inactivated SARS-CoV vaccine induced strong systemic and local antibody responses.
• RBD-Fc and RBD-rAAV vaccines demonstrated effective neutralizing antibodies and protection in animal models.
• RBD-rAAV vaccination, especially with prime/boost, induced prolonged, increasing neutralizing antibody levels and protective T-cell responses.

Conclusions:

• Inactivated vaccine, RBD-Fc, and RBD-rAAV are potential candidates for SARS vaccine development.
• Intranasal vaccination may be a preferred route, inducing both local and systemic immunity.
• Different prime-boost strategies impact T-cell profiles, suggesting tailored approaches for optimal immune response.