Background African swine fever (ASF) is an important disease affecting swine and has a significant economic loss on both the developed and developing world but due to the lack of vaccines, drug, and effective control measures, ASF virus remains a serious threat to global pork production. The activities of medium-chain fatty acids (MCFAs) against viral pathogens have been reported previously. However, the effects of this family on ASFV have been not yet investigated. In this study, we evaluated the potential effects of MCFAs in individual and synergistic forms, to prevent and/or reduce ASFV infection using in vitro feed and water models. Results The potential effects of MCFAs, including C8, C6-C8-C10 (1:1:1 ratio) and C8-C10-C12 (1:1:1 ratio) against a field ASFV strain isolated in Red River Delta region of Vietnam were further examined by real-time PCR in in vitro feed and water models. All tested products have shown a strong antiviral effect against ASFV infectivity at doses of 0.375% and 0.5% in both feed and water assays. Interestingly, the synergistic MCFAs have shown clearly their potential activities against ASFV in which at lower dose of 0.25%, pre-treatment with product 2 and 3 induced significant increases at the level of Cq value when compared to positive control and/or product 1 (P < 0.05). Conclusions To our knowledge, it is the first report on in vitro examination of the anti-ASFV activities of the MCFAs. Our findings suggested that all tested products, both individual and synergistic forms of MCFAs, have possessed a strong anti-ASFV effect and this effect is dose- dependence in in vitro feed and water models. Additionally, synergistic effects of MCFAs are more effective against ASFV when compared to individual form. The further studies focusing on in vivo anti-ASFV effects of MCFAs are very important to bring new insight into the mode of ASFV-reduced action by these compounds in swine feed and water consumption.
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