New Study Reveals Promising Antiviral Agent Against Fish Iridoviruses

Research conducted by scientists from Northwest A&F University has identified a compound called chlorchinaldol as a potent antiviral agent against fish iridoviruses, including the largemouth bass virus (LMBV) and Singapore grouper iridovirus (SGIV). These viruses pose significant threats to aquaculture industries, resulting in substantial economic losses. The study highlights the importance of developing effective therapeutic strategies to combat these viruses. Funding for the research was provided by the National Natural Science Foundation of China (NSFC).

Key Takeaways:

• Chlorchinaldol, a quinoline derivative, exhibited significant anti-LMBV activity in vitro and in vivo, inhibiting viral replication, reducing viral titers, and suppressing cytopathic effects (CPE).
• Chlorchinaldol demonstrated prophylactic and therapeutic efficacy, significantly mitigating LMBV-induced cellular damage and enhancing survival rates in infected largemouth bass.
• Mechanistic investigations revealed that chlorchinaldol interferes with viral adsorption to host cells and suppresses late-stage viral protein synthesis.
• Chlorchinaldol also showed potent anti-SGIV activity in EPC cells, with an IC50 of 10.01 μM and suppression of viral titers and CPE.
• This research has been peer-reviewed and published in the journal Aquaculture.

Statistics:

• The half-maximal inhibitory concentration (IC50) of chlorchinaldol against LMBV was 9.40 μM.
• Chlorchinaldol reduced viral loads in infected organs by 50% in vivo experiments.
• The survival rate of LMBV-infected largemouth bass treated with chlorchinaldol was significantly higher than in the control group (70% vs. 30%).
• Chlorchinaldol also demonstrated 90.1% suppression of LMBV-induced CPE in EPC cells.

Sources:

• NewsRx. New Findings Reported from Northwest A&F University Describe Advances in Iridovirus (Chlorchinaldol: a Promising Antiviral Agent Against Iridoviruses In Fish). Life Science Weekly. October 21, 2025; p 2673.
• (Elsevier - www.elsevier.com; Aquaculture - www.journals.elsevier.com/aquaculture/)
• Aquaculture: Chlorchinaldol: a Promising Antiviral Agent Against Iridoviruses In Fish.