Monitoring for Mycoplasma hyopneumoniae before and after a partial depopulation program using a typing scheme based on the polyserine repeat motif of p146
Pablo Tamiozzo, MSc, Dr; Paula MarÃa Alejandra Lucchesi, Dr; Arnaldo Ambrogi, MSc
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Mycoplasma hyopneumoniae diversity was determined using a molecular typing method based on the polyserine repeat motif within the p146 gene. Three related Argentinian farms (A, B, and C) were investigated. To obtain a population free of enzootic pneumonia on Farm C, a partial depopulation program had been carried out first on Farm A and then on Farm B. Finally, Farm C was populated with early-weaned piglets from Farm B. To evaluate the success of the partial depopulation program, the farms were monitored for clinical signs and by serological testing, lung examination at slaughter, and nested polymerase chain reaction (nPCR). It was concluded that they were free of enzootic pneumonia, but M hyopneumoniae remained despite the eradication measures applied. An outbreak of enzootic pneumonia in Farm C triggered an investigation of M hyopneumoniae genetic diversity in these farms. For this purpose, all DNA samples obtained from PCR-positive nasal swabs were further characterized using another nPCR designed for M hyopneumoniae typing. Several M hyopneumoniae types were identified in these farms, but one strain seemed to be present before and after the application of the partial depopulation program. Unambiguous discrimination of M hyopneumoniae would require analysis of other genomic regions.
Keywords: Mycoplasma hyopneumoniae, typing, persistence, polymerase chain reaction, PCR
Cite as: Tamiozzo P, Lucchesi PMA, Ambrogi A. Monitoring for Mycoplasma hyopneumoniae before and after a partial depopulation program using a typing scheme based on the polyserine repeat motif of p146. J Swine Health Prod 2013;21(6):309-312.
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