These baits are recombinant vaccinia/rabies glycoprotein, which is an oral vaccine intended to control rabies in wildlife. Recombinant means they have spliced two viruses together. In addition to the rabies virus, these baits also carry vaccinia which is the immunizing agent used in smallpox vaccines. This combination of two viruses is an example of a genetically modified vaccine. Genetically modified vaccines have some pretty nasty and unpredictable habits. The first problem is the viruses in rabies baits are live and that can cause some problems.
With Baited Breath – Problems with Rabies Baits