RT Journal Article T1 Microsporidia as a Potential Threat to the Iberian Lynx (Lynx pardinus) A1 Izquierdo, Fernando A1 Ollero, Dolores A1 Magnet, Angela A1 Galván Díaz, Ana L. A1 Llorens, Sergio A1 Vaccaro, Lucianna A1 Hurtado Marcos, Carolina A1 Valdivieso, Elizabeth A1 Hernández, Leticia A1 Miró Corrales, Guadalupe A1 Montoya, Ana A1 Bornay Llinares, Fernando J. A1 Acosta, Lucrecia A1 Fenoy, Soledad A1 del Águila, Carmen AB Lynx pardinus is one of the world’s most endangered felines inhabiting the Iberian Peninsula. The present study was performed to identify the presence of microsporidia due to the mortality increase in lynxes. Samples of urine (n = 124), feces (n = 52), and tissues [spleen (n = 13), brain (n = 9), liver (n = 11), and kidney (n = 10)] from 140 lynxes were studied. The determination of microsporidia was evaluated using Weber’s chromotrope stain and Real Time-PCR. Of the lynxes analyzed, stains showed 10.48% and 50% positivity in urine and feces samples, respectively. PCR confirmed that 7.69% and 65.38% belonged to microsporidia species. The imprints of the tissues showed positive results in the spleen (38.46%), brain (22.22%), and liver (27.27%), but negative results in the kidneys. PCR confirmed positive microsporidia results in 61.53%, 55.55%, 45.45%, and 50%, respectively. Seroprevalence against Encephalitozoon cuniculi was also studied in 138 serum samples with a positivity of 55.8%. For the first time, the results presented different species of microsporidia in the urine, feces, and tissue samples of Lynx pardinus. The high titers of anti-E. cuniculi antibodies in lynx sera confirmed the presence of microsporidia in the lynx environment. New studies are needed to establish the impact of microsporidia infection on the survival of the Iberian lynx. SN 2076-2615 YR 2022 FD 2022-09-20 LK https://hdl.handle.net/20.500.14352/73209 UL https://hdl.handle.net/20.500.14352/73209 LA eng NO USP-CEU DS Docta Complutense RD 4 may 2024