Factorial experimental design applied to the immunological study of two foot-and-mouth disease virus subtypes. 2. Theoretical study of experimental models.

A certain number of theoretical models of immunological relations that 2 foot-and-mouth disease viruses can support, were constructed so as to discuss in each case, the results of the factorial analysis of the data. This method provided a specific answer to each of the questions that were asked in the presence of a test of this kind. The results obtained with several immunological cross-tests comparable to that of the A Greece 69-A Allier viruses, illustrated most of the theoretical models.