Strains of the Virus of Foot-and-Mouth Disease Recovered from Outbreaks in Mexico

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Abstract
This paper serves as an introduction to a series of 6 dealing with the virus of foot-and-mouth disease recovered from the Mexican outbreak. It describes the methods used in studying the virus and points out that, though the Mexican outbreak is caused by a "Vallee A type" virus, a better immunity is induced by homologous (Mexican) strains of the virus than by heterologous stock strains of "Vallee A type" virus. Strains of the Mexican virus to be used as vaccine should be selected on the basis of good im-munogenicity and of as wide a range of group antigenicity as possible. The paper indicates that in applying methods of control involving vaccination, continual guidance and indeed direction of the program must come from the laboratory.