The growth characteristics, morphology, and biochemical activity of four strains of a hemolytic, urease-positive, gram-negative organism isolated from vaginal exudate of postparturient sows closely resembled those of organisms belonging to the genus . Comparison by agglutination, immunodiffusion, and electrophoresis in acrylamide gel revealed that the four strains were identical. They were distinguished from , and other members of the family by means of these three techniques. The four strains were related antigenically to all strains of the genus examined, but were related most closely to and . The antigenic relatedness and other similarities support inclusion of the organism in the genus . Its biochemical, antigenic, and electrophoretic differences from established species of the genus support the conclusion that this swine actinobacillus is a new species. A species name is not proposed for this organism because of the present uncertain taxonomic status of related actinobacilli. The swine actinobacillus persisted in the vagina of two sows for at least 40 days after intravaginal inoculation; however, proof that vaginal infection with the organism causes urogenital disorders of any type has not been obtained. Intraperitoneal and intravenous inoculation of four 6-week-old colostrum-deprived pigs with the organism resulted in no clinical or postmortem evidence of disease. Strain 192 (= ATCC 27072 = NCTC 10801) is the representative strain of this group of swine actinobacilli.


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