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Abstract

The aim of this study was to measure the occurrence of brucellosis, leptospirosis and neosporosis in cows from 25 family farms milk, with semi-intensive grazing system, located in the Southwest region of Paraná, Brazil. Eighty-four cows with retained placenta, between July 2013 to July 2014,...

Author(s)
Porto, Y. F.; Pinto Neto, A.; Bernardi, F.; Possa, M. G.; Mota, M. F.; Martinez, A. C.; Merlini, L. S.; Berber, R. C.
Publisher
Colégio Brasileiro de Patologia Animal, Rio de Janeiro, Brazil
Citation
Pesquisa Veterinária Brasileira, 2018, 38, 8, pp 1537-1542
Abstract

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....

Author(s)
NóBrega, P.
Citation
Biologico, 1963, 29, pp 149-163

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