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There was a good correlation between the content of 140S viral particles of type A27-Colombia, O1-Colombia and O1-Campus aphthovirus, and the protective dose of vaccine for cattle. The technique of determining the content of 140S particles is dealt with in parts I and II, on pages 13-26 and 27-38...

Gerardino, A. G. de; Restrepo S., G.; Gonzalez, O.
Office International des Epizooties, Paris, France
XVIth Conference of the Foot and Mouth Disease Commission, Paris, 14th-17th September 1982., 1982, pp 39-50