Clinical, obstetric and immunological observations on pregnant queens experimentally infected with different isolates of Toxoplasma gondii (Nicolle & Manceaux, 1909): Preliminary results - Sakamoto, C. A. M; Costa, A. J; Gennari, Solange Maria; Pena, Hilda Fátima de Jesus; Bichuette, Murilo A; Bettini, Carlos Maia; Amarante, A. T; Bresciani, Katia Denise Saraiva (International Conference of the World Association for the Advancement of Veterinary Parasitology, 2007)