RT Journal Article T1 Characterization of a novel murine model of Toxoplasma gondii infection using oocysts of a recently obtained Type III isolate A1 Largo de la Torre, Andrea A1 Ferré Pérez, Ignacio A1 Sánchez Sánchez, Roberto A1 Regidor Cerrillo, Javier A1 Ortega Mora, Luis Miguel AB Type II reference isolates of Toxoplasma gondii are widely used in animal toxoplasmosis models, but studies with Type III isolates remain scarce. In addition, these methods often rely on laboratory-adapted parasite stages that may not reflect natural infection. This study presents a new murine model based on an oral infection with oocysts from a recently obtained Type III isolate, TgShSp24, which exhibited remarkable morbidity and a distinct tissue distribution during chronic infection, differing from the recently obtained Type II isolate TgShSp1. This novel model aims to better mimic natural infection and provides a valuable tool for testing drugs and vaccines. PB Springer SN 0928-4249 YR 2025 FD 2025-04-02 LK https://hdl.handle.net/20.500.14352/120104 UL https://hdl.handle.net/20.500.14352/120104 LA eng NO Largo-de la Torre, A., Ferre, I., Sánchez-Sánchez, R., Regidor-Cerrillo, J., Ortega-Mora, L.M (2025) Characterization of a novel murine model of Toxoplasma gondii infection using oocysts of a recently obtained Type III isolate. Vet Res 56, 73. https://doi.org/10.1186/s13567-025-01507-x NO Contributions:LMOM, JRC and IF conceived the study and participated in its design. RSS carried out the oocyst production and, together with ALT, participated in the inoculation of animals. ALT conducted the clinical examination of animals, performed necropsies and collected samples. JRC and ALT analyzed the data, carried out statistical analyses and interpreted the results. ALT and JRC wrote the manuscript with result interpretation and inputs from LMOM and I.F. All authors read and approved the final manuscript. NO Comunidad de Madrid NO Ministerio de Ciencia e Innovación (España) DS Docta Complutense RD 18 dic 2025