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Lung and intestine of 49 pigs with respiratory diseases and endocervical swabs from 205 sows with reproductive disorders were investigated for chlamydial infection by polymerase chain reaction. PCR primers targeted DNA sequences on the chlamydial  omp1  or  omp2  genes. PCR amplicons were generated from 49·0% of pigs with respiratory disease, from 60·0% of sows with reproductive disorders, from 24·5% of respiratory healthy controls, but from no endocervical swabs from fertile sows. By DNA hybridization, a high prevalence of mixed infections with  Chlamydophila abortus  and  Chlamydia suis  in the porcine lung and intestine was found and confirmed by RFLP and nucleotide analysis. Of the  omp1 -PCR amplicons from endocervical swabs 81·3% were identified as  Chlamydophila abortus , indicating an association of this chlamydial species with reproductive disorders in sows. Nucleotide sequence analysis of  omp1 -amplicons identified as deriving from  Chlamydia suis  shared a maximum of 82·7% homology with the reference strain S45.

epidemiology and infection

PCR-based detection of chlamydial infection in swine and subsequent PCR-coupled genotyping of chlamydial <i>omp1</i>-gene amplicons by DNA-hybridization, RFLP-analysis, and nucleotide sequence analysis

PCR-based detection of chlamydial infection in swine and subsequent PCR-coupled genotyping of chlamydial omp1-gene amplicons by DNA-hybridization, RFLP-analysis, and nucleotide sequence analysis