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Implementation of a PCR assay of Pasteurella pneumotropica to accurately screen for contaminated laboratory mice

Abstract

The authors implemented a PCR protocol to rapidly screen for Pasteurella pneumotropica and to accurately identify contaminated laboratory mice in a clinical setting. This protocol was implemented in response to a severe outbreak of P. pneumotropica in their animal facility. Although a sentinel program was in place to routinely screen for P. pneumotropica, it was inadequate for the identification of contaminated animals. As a result, several additional strains of mice were contaminated and developed clinical signs of infection. The authors implemented a screening method using PCR with reported primer pairs previously developed to identify the biotype isolates of P. pneumotropica in laboratory mice. Throat culture swabs were collected from live mice and placed in a bacterial culture. The DNA from these cultures was isolated and screened by PCR. This procedure enabled the authors to eliminate P. pneumotropica from several animal housing rooms. The assay can be easily applied in most animal facilities.

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Figure 1: Swabbing method for obtaining a bacterial sample from the throat of a mouse.
Figure 2: PCR identification of P. pneumotropica in samples obtained from monogamous breeding pairs after 7 d of contact.
Figure 3: PCR identification of P. pneumotropica in samples obtained from monogamous breeding pairs after 21 d of contact.

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Acknowledgements

We thank Christian Demers, Richard Ashby and Dr. Jean-François Cloutier for their careful revision of the manuscript and Drs. Christine Vande Velde and Emmanuelle Brocheiro for permission to use their mice.

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Correspondence to Hélène Héon.

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The authors declare no competing financial interests.

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Ouellet, M., Cowan, M., Laporte, A. et al. Implementation of a PCR assay of Pasteurella pneumotropica to accurately screen for contaminated laboratory mice. Lab Anim 40, 305–312 (2011). https://doi.org/10.1038/laban1011-305

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