Beaudeau et al. Acta Veterinaria Scandinavica 2010, 52:33 http://www.actavetscand.com/content/52/1/33 Acknowledgements We thank Maj Hjort for valuable technical assistance and the Swedish Dairy Association for providing blood samples and information from the database. Author Details 1ONIRIS, UMR 1300 Bioagression, Epidémiologie et Analyse de Risque, BP 40706, F-44307, Nantes, France, 2INRA, UMR 1300 Bioagression, Epidémiologie et Analyse de Risque, BP 40706, F-44307, Nantes, France, 3Université Nantes Angers Le Mans, Nantes, France, 4Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, SE-750 07, Uppsala, Sweden and 5Department of Disease Control and Epidemiology, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden Received: 29 March 2010 Accepted: 21 May 2010 Published: 21 May 2010 TA©hc2tisa0ia1Vsr0etaiBncelreOianipuasderainevaASuiclaebntsldaelin;farlioctvmiecnl:aeshe2dte0isp1Bt:r0/io,bwM5uw2te:dw33C.auecntdavraerltLshcteda.ntedr.mcosmo/fctohnetCerneta/5ti2v/e1C/3o3mmonsAt ributionLicense(ht p:/ creativecommons.org/licenses/by/2.0),whichpermitsunrestricteduse,distribution,andreproductioninanymedium,providedtheoriginalworkisproperlycited. References 1. Clark MA: Bovine coronavirus. 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