Serological study of brucellosis and leptospirosis in equines of island Maiandeua (Algodoal) state of Pará oleh Ana Paula Vilhena Beckman Pinho, Rosely Bianca Santos Kuroda, Silvio Arruda Vasconcellos, José Soares Ferreira Neto, Raul Ossada, Vanessa Aparecida Feijó de Souza, Katarine de Souza Rocha, Giselle Souza da Paz, Carla Cristina Guimarães de Moraes