Improved Vaccine against PRRSV: Current Progress and Future Perspective.

Area of Science:

• Veterinary Virology
• Immunology
• Swine Disease Control

Background:

• Porcine reproductive and respiratory syndrome virus (PRRSV) causes significant global economic losses in the swine industry due to reproductive and respiratory syndromes.
• Emergence of highly pathogenic PRRSV strains and constant evolution of new variants render current control strategies and vaccines largely inadequate.
• Licensed vaccines face safety and efficacy concerns, including modified live virus shedding, reversion to virulence, and insufficient protection against heterogeneous strains.

Purpose of the Study:

• To systematically review recent advancements in Porcine reproductive and respiratory syndrome virus (PRRSV) vaccine development.
• To highlight novel strategies and insights for creating superior PRRSV vaccines that overcome current limitations.
• To address the urgent need for effective PRRSV vaccines to mitigate economic impacts on the swine industry.

Main Methods:

• Review of scientific literature focusing on PRRSV evolution, immunology, and vaccine technologies.
• Analysis of emerging PRRSV variants and their antigenic properties.
• Evaluation of novel vaccine approaches including epitope identification, antibody development, chimeric viruses, and interferon-inducing strains.
• Emphasis on techniques to improve current modified live virus (MLV) vaccines.

Main Results:

• PRRSV evolution necessitates continuous vaccine development to address antigenic variations.
• Identification of neutralizing epitopes and development of broad neutralizing antibodies show promise for broader protection.
• Reverse genetics enabling chimeric virus creation and novel strains with enhanced immunogenicity offer new avenues.
• Techniques to improve existing MLV vaccines are being explored to enhance safety and efficacy.

Conclusions:

• An urgent need exists for effective Porcine reproductive and respiratory syndrome virus (PRRSV) vaccines due to evolving viral strains and limitations of current options.
• Recent advancements in understanding PRRSV evolution, immunology, and novel vaccine technologies offer promising strategies for improved control.
• Future PRRSV vaccine development should focus on overcoming existing vaccine disadvantages to minimize economic impact on the global swine industry.