Comparison of four antibiotics for inactivating leptospires in bull semen diluted in egg yolk extender and experimentally inoculated with Leptospira santarosai serovar guaricura - Miraglia, Fabiana; Morais, Zenaide Maria; Cortez, Adriana; Melville, Priscilla Anne; Marvullo, Maria Fernanda Vianna; Richtzenhain, Leonardo José; Visintin, Jose Antonio; Vasconcellos, Silvio Arruda (Brazilian Journal of Microbiology, 2003)