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Agglutination tests with five serotypes as antigens were done on sera from 763 cattle. Positive results were obtained 30 times with L. ìcterohaemorrhagiae antigen, 14 times with pomona antigen, 11 times with grippo-typhosa antigen and twice with canicola antigen. The titres to pomona and ...

Guida, V. O.; Santa Rosa, C. A.; D'Apice, M.; Corrêa, M. O.; Natale, V.
S. Paulo,
Archivos do Instituto Biologico, Sao Paulo, 1959, 26, pp 109-117

Foot and mouth disease virus. Type A. was rendered avirulent by 28 passages in day old chicks or 12 in embryonated eggs. These strains, were non-pathogenic, had good antigenicity and did not spread by contact. In field trials with the chick embryo strain immunity lasted at least eight months....

NóBrega, P.
Biologico, 1963, 29, pp 149-163

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