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Live-Attenuated Vaccines Against African Swine Fever: Strategies, Lessons, and Prospects
Chunhao Jiang1,2, Ruojia Huang1, Rui Luo1
1State Key Laboratory of Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China.
Abstract:
African swine fever (ASF), caused by African swine fever virus (ASFV), is a devastating swine disease. To date, no commercial ASF vaccine has been authorized for global marketing except in Vietnam, and emerging genotype I/II recombinant ASFV strains pose severe new challenges to ASF control. Live-attenuated vaccines (LAVs) are widely recognized as the most promising strategy for ASF control. This review systematically summarizes three conventional development strategies for ASF LAVs, dissects the molecular mechanisms of two core bottlenecks-intergenotypic ASFV recombination and vaccine strain reversion to virulence-and elaborates rational design strategies for next-generation LAVs based on cutting-edge technologies. These strategies can fundamentally mitigate the aforementioned risks, offering promising solutions for addressing the major limitations of conventional ASF LAVs.
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