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As key prey, the wild rabbit downsize constitutes a major drawback on the endangered Iberian lynx (Lynxpardinus) re-introduction in the Iberia. Several captive breeding units mostly located in Alentejo, endeavour the wildrabbit repopulation of depleted areas assigned for the lynx re-introduction.Here we report an RHDV2 outbreak that occurred in early 2016 in a wild rabbit captive breeding unit locatedin Barrancos municipality. The estimated mortality rate between March and April 2016 was approximately 8.67%.Anatomopathologic examination was carried out for 13 victimized rabbits. Molecular characterization was based onthe complete vp60 capsid gene.The 13 rabbit carcasses investigated showed typical macroscopic RHD lesions testing positive to RHDV2-RNA. Comparison of the vp60 nucleotide sequences obtained from two specimens with others publically availabledisclosed similarities below 98.22% with RHDV2 strains originated in the Iberia and Azores and revealed that the twoidentical strains from Barrancos-2016 contain six unique single synonymous nucleotide polymorphisms.In the phylogenetic analysis performed, the Barrancos-2016 strains clustered apart from other known strains,meaning they may represent new evolutionary RHDV2 lineages. No clear epidemiological link could be traced forthis outbreak where the mortalities were lower compared with previous years. Yet, network analysis suggested apossible connection between the missing intermediates from which the strains from Barrancos 2013, 2014 and 2016have derived. It is therefore possible that RHDV2 has circulated endemically in the region since 2012, with periodicepizootic occurrences.Still, six years after its emergence in wild rabbits, RHDV2 continues to pose difficulties to the establishment ofnatural wild rabbit populations that are crucial for the self-sustainability of the local ecosystems

Tracking the Origin of a Rabbit Haemorrhagic Virus 2 Outbreak in a Wild Rabbit Breeding Centre in Portugal; Epidemiological and Genetic Investigation