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First detection of porcine circovirus type 2e in Europe

This is the first report of the detection and genetic characterisation of the PCV-2e genotype in Europe, from sows on a farm in Italy.

11 August 2022
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Porcine circovirus 2 (PCV-2) infections are among the most economically important in swine farming. Because of the high evolutionary rate of PCV-2, several variants have emerged and are currently classified into several genotypes. However, only three (i.e. PCV-2a, PCV-2b, and PCV-2d) have a worldwide distribution, with other genotypes restricted to certain geographical regions and/or for limited time periods. Underdiagnosis or underreporting of these genotypes cannot be excluded.

This is the first report of the detection and genetic characterisation of the PCV-2e genotype in Europe, from sows on a farm in Italy showing no clinical evidence of porcine circovirus disease. A follow-up study demonstrated persistent subclinical evidence of PCV-2e on the farm, at low frequency and viral load.

This incidental finding emphasises the need for more intensive routine monitoring activities involving asymptomatic animals, coupled with DNA sequencing and data sharing. Considering the relevant genetic and phenotypic divergence of such genotypes, the actual efficacy of currently applied vaccines and diagnostic assays should be further evaluated.

Franzo G, Ustulin M, Zanardelli P, Castellan A, Villa N, Manfredda A, Vio D, Drigo M. First detection of porcine circovirus type 2e in Europe. The Veterinary Journal. 2022; 279: 105787. https://doi.org/10.1016/j.tvjl.2022.105787

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