18. Gerbier G, Garin-Bastuji B, Pouillot R, Véry P, Cau C, Berr V, Dufour B, Moutou F 1997 False positive serological reactions in bovine brucellosis: evidence of the role of Yersinia enterocolitica serotype O:9 in a field trial. Veterinary Research 28:375-383