Prospective systematic study of Yersinia spp. in dogs

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Abstract
Yersini spp. (93) were isolated from 68 of 252 dogs in Shimane Prefecture, Japan. The Yersinia spp. were 70 Y. enterocolitica isolates from 50 dogs, 2 Y. frederiksenii isolates from 2 dogs, 5 Y. intermedia isolates from 5 dogs and 16 Y. pseudotuberculosis isolates from 16 dogs. Fifteen of 70 Y. enterocolitica isolates belonged to biotype 4 serotype O3 phagotype 8 (6 isolates), biotype 4 (maltose negative) serotype O3 phagotype 8 (4 isolates), biotype 3 (Voges-Proskauer and sorbose negative) serotype O3 phagotype 9 (2 isolates) and biotype 2 serotype O5.27 (3 isolates). The other 55 Y. enterocolitica isolates belonged to biotype 1 and were classified into serotypes O4, O5, O7.8, O9, O10, O12, O13.7, O14, O15 and untypable. Sixteen Y. pseudotuberculosis isolates belonged to serotypes IB (2), IIB (2), IVA (2), IVB (3), VA (5) and untypable (2). These isolates were mostly detected in cold months. Y. enterocolitica serotype O3 and Y. pseudotuberculosis were isolated more frequently from puppies, Y. enterocolitica serotype O3 was recovered at < 107.0 cells/g of the jejunal-to-rectal contents and at < 102 cells/g of mesenteric lymph nodes. Y. pseudotuberculosis was recovered at < 104.3 cells/g of the cecal-to-rectal contents and at < 102.9 cells/g of mesenteric lymph nodes. Almost all strains of Y. enterocolitica biotype 1, Y. intermedia and Y. frederiksenii were recovered at < 102 cells/g of gastric-to-rectal contents.