Journal article
Specific detection of Serpulina hyodysenteriae and potentially pathogenic weakly beta-haemolytic porcine intestinal spirochetes by polymerase chain reaction targeting 23S rDNA
Danish Veterinary Laboratory1
Management, National Veterinary Institute, Technical University of Denmark2
National Veterinary Institute, Technical University of Denmark3
Section for Veterinary Diagnostics, Division of Veterinary Diagnostics and Research, National Veterinary Institute, Technical University of Denmark4
Division of Veterinary Diagnostics and Research, National Veterinary Institute, Technical University of Denmark5
A 2470-bp section of the 23S ribosomal DNA from Serpulina hyodysenteriae and five biochemical ly different groups of weakly beta-haemolytic porcine intestinal Serpulina strains was sequenced. The similarity between the sequenced strains was high (96.85% to 99.84%). A phylogenetic tree was estimated by the maximum likelihood method.
The sequenced strains formed three groups. Serpulina hyodysenteriae and biochemical group II ('S. intermedius') formed a cluster, but 20 nucleotide positions were different between the two, suggesting that biochemical group II is a separate species. Another cluster consisted of the closely related biochemical group IIIa ('S. murdochii') and IIIb/c (S. innocens) (99.84% similarity), while biochemical group IV (S. pilosicoli) constituted a separate group with a relatively low similarity (96.85% to 9701%) to the other groups.
Three primer pairs were designed for specific PCR detection of the clinically important S. hyodysenteriae and biochemical group II and IV. PCR amplification was accomplished with DNA extracted from bacterial colonies by a simple boiling procedure, and with DNA extracted directly from porcine stool samples using a bead beating extraction procedure.
The level of detection for the direct extraction and amplification method was 5 x 10(5) cells added g(-1) normal faeces.
Language: | English |
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Year: | 1997 |
Pages: | 363-372 |
ISSN: | 10961194 and 08908508 |
Types: | Journal article |
DOI: | 10.1006/mcpr.1997.0129 |
ORCIDs: | Jensen, Tim Kåre |