November 29, 2023
Credit: Pixabay/CC0 Public Domain

The U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS) has announced that researchers have reclassified the number of African Swine Fever (ASF) virus strains from 25 to only six unique genotypes. This scientific innovation may help redefine how ASF researchers across the globe classify ASF virus (ASFV) isolates and may make it easier for scientists to develop vaccines that match the different strains circulating in ASF endemic areas across the globe.

The work is published in the journal Viruses.

“Previously, 25 different virus genotypes were identified across the globe,” said senior ARS scientist Douglas Gladue. “Our research team recently re-evaluated all the publicly available virus DNA sequence and found that the majority of genotypes () originally identified as novel were not correctly identified nor compared to already existing ASFV virus genotypes. Based on this analysis, there are actually fewer unique genotypes than the ASF research community believed, and that means that there is less diversity of ASFV affecting communities across the globe. This information is important as it may reduce the number of vaccines previously thought to be needed to protect against all ASFV genotypes.”

Accurate classification of viruses is paramount for epidemiological investigations and the development of cost-effective countermeasures, including designing vaccines for unique strains of ASFV.

This large-scale effort involved ARS researchers re-analyzing over 12,000 historical and current virus isolates that were produced from ASFV labs worldwide. The effort was made possible using the computing power of SciNet, which is ARS’s supercomputer cluster for solving agricultural big data problems.

Although the ASFV virus is causing profound economic losses to the global swine industry, there have not been any outbreaks in the United States. The highly contagious ASF virus spread from Africa to the Republic of Georgia in 2007, and has since swept through Europe, the Dominican Republic, and Asia, before reaching South Africa in early 2023. The is unable to transmit from pigs to humans.

This research includes research and development input from the National Bio and Agro-Defense Facility, the Canadian Food and Inspection Agency, and Makerere University in Uganda.

More information:
Edward Spinard et al, A Re-Evaluation of African Swine Fever Genotypes Based on p72 Sequences Reveals the Existence of Only Six Distinct p72 Groups, Viruses (2023). DOI: 10.3390/v15112246

Researchers confirm six unique strains of African swine fever virus (2023, November 13)
retrieved 13 November 2023

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