Abstract
In reporting the results of a trial of contraceptive vaccines in wild horses, Gray et al. (2010) misidentified one of the vaccines as SpayVac®, a porcine zona pellucida (pZP) vaccine that owes its typically very high efficacy to a special DepoVax® liposome technology. We believe that the absence of DepoVax® liposomes ought to have been considered as a possible explanation for the unexpectedly low efficacy that was observed.
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