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The method of determining whether a given strain (S2) is a variant of another strain (SJ is known as the "six point test", in which 6 groups of 4 cattle each, designated A, B, C, A1, B1, C1, are used. Groups A and A1, B and B1, and C and C1are inoculated with a vaccine consisting only of Sj, in...

Lucam, F.; Fedida, M.; Dannacher, G.; Perraud, J.
Bulletin de l'Academie Veterinaire de France, 1966, 39, pp 193-197