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Another microscopic image: PCV3 virus photographed in a pig’s spleen.

detection should not have any public health implications.

PCV3 in animals other than pigs Last but not least – does the virus also occur outside swine or wild boar, that is, in wildlife species in Spain? The answer to that question appears to be “no.” The reason for the research, however, was the fact that PCV3 DNA had been confirmed in Italian wild ruminants and relat- ed haematophagous ectoparasites. To figure out whether in Spain the situation was similar, the CReSA-IRTA team in coop- eration with the Polish National Veterinary Institute and the Universitat Autònoma de Barcelona investigated samples from a range of animals such as hunted red deer, rabbits and hares. They concluded: “The present study indicated that wild ruminants and lagomorphs do not play a significant role in the epidemiology of PCV3 in Spain, suggesting that these in- fections may be caused by eventual spillover events.”

Next steps: Pathogenesis of PCV3 All in all, even though the effect and impact of the virus can- not be compared to PCV2, there is some reason to keep an eye on it. Dr Sibila said, “In most cases, PCV3 infection will be subclinical (of unknown impact). However, in our opinion, it is worthwhile including PCV3 in the potential list of viruses causing an increase of the normal rate of stillborn and mummified foetuses and/or potential cause of pre- and post-weaning disorders.” The team will continue to investigate the virus. Dr Sibila said, “Now we are working on the pathogenesis of PCV3 infection. Hopefully, we will be able to share the results obtained in the next ESPHM.”

The first paper described in this article was an oral presentation at ESPHM 2020+1; it was carried out by V. Saporiti, F. Klaumann, M. Sibila and J. Segalés, CReSA-IRTA; S. Martorell and M. Balasch, Zoetis; T.F. Cruz, São Paulo State University, Brazil. J. Segalés is also attached to the Universitat Autònoma de Barcelona, Spain.

▶ PIG PROGRESS | Volume 37, No. 7, 2021 17

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