Serotyping and pathogenicity of Erysipelothrix strains isolated from tonsils of slaughter pigs in Thailand.
Erysipelothrix strains were isolated from the tonsils of 46 (15.0%) of 307 apparently healthy slaughter pigs in Thailand during the period of August to September, 1997. A total of 27 of the 46 Erysipelothrix isolates could be classified into 5 serovars but the remaining 19 were untypable in this study. Of the 25 isolates serologically identified as Erysipelothrix rhusiopathiae, 20, 4, and 1 isolates belonged to serovars 2, 12, and 17, respectively. Only 2 isolates from the tonsils belonged to Erysipelothrix tonsillarum and represented either serovar 7 or 10. Although the periods and the districts of the survey were limited, the information obtained in the present investigation demonstrates the presence of a variety of serovars in pigs in Thailand. Of 29 selected isolates belonging to serovars 2, 7, 10, 12, 17, and untypable, only 5 (17.2%) were virulent for both mice and pigs. Five of these virulent isolates belonging to serovars 2 and 12 killed less than 30% of mice immunized with a swine erysipelas bacterin commercially available in Thailand, suggesting that the vaccine elicited a sufficient immunity to these field isolates.
Takahashi
T
T
National Veterinary Assay Laboratory, Kokubunji, Tokyo, Japan.
Sunama
P
P
Satra
J
J
Cholsindhu
N
N
Kongthon
S
S
Jitnupong
W
W
Yamamoto
K
K
Kijima
M
M
Furuuchi
S
S
D000372:Agglutination Tests / Q000662:veterinary; D000818:Animals; D001428:Bacterial Vaccines / Q000592:standards; D015169:Colony Count, Microbial / Q000662:veterinary; D004269:DNA, Bacterial / Q000737:chemistry; D004888:Erysipelothrix / Q000145:classification* / Q000276:immunology / Q000472:pathogenicity*; D004889:Erysipelothrix Infections / Q000453:epidemiology / Q000382:microbiology* / Q000517:prevention & control; D005260:Female; D007114:Immunization / Q000662:veterinary; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D014066:Palatine Tonsil / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000662:veterinary; D012703:Serotyping / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology / Q000382:microbiology* / Q000517:prevention & control; D013785:Thailand / Q000453:epidemiology; D014774:Virulence
D001428:Bacterial Vaccines; D004269:DNA, Bacterial