1. Animals immunised with a polyvalent virus and tested with the same virus show reactions when subsequently retested with the identical virus.
2. When the immunity was tested with constituents of this virus, breakdowns occurred to a large extent in the first test, and even in the second test, showing that the virus, considered to be polyvalent, did not contain all the
constituents which were originally mixed. The fact remains, however, that none of the tested animals died, thus showing that the immunity resulting from the CD (composite district) virus protected against any of the constituents.
3. For the purposes of the practice, where such severe tests are hardly encountered, the immunity given by this CD virus should prove sufficient.
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