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Objective—To determine whether commercial Mycoplasma hyopneumoniae bacterins sold for use in swine contain porcine torque teno virus (TTV).

Sample Population—22 commercially available M hyopneumoniae bacterins.

Procedures—Direct and nested PCR assays for genogroup-specific TTV DNAs were performed on serials of M hyopneumoniae bacterins by use of published and custom-designed primer pairs at 3 laboratories in North America and Europe.

Results—Of the 22 bacterins tested by use of direct and nested PCR assays, 7 of 9 from the United States, 2 of 5 from Canada, and 4 of 8 from Europe contained genogroup 1– and genogroup 2–TTV DNAs. In some bacterins, the TTV DNAs were readily detected by use of direct PCR assays.

Conclusions and Clinical Relevance—Analysis of these data indicated that many of the commercially available M hyopneumoniae bacterins were contaminated with TTV DNA. It is possible that some of these bacterins could inadvertently transmit porcine TTV infection to TTV-naïve swine.

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in American Journal of Veterinary Research