Frequency of Trichinella spiral is in blood and muscles of horses from two slaughter houses (industrial and rural) in the State of Mexico, Mexico. - Jiménez-Cardoso, Enedina; Caballero-García, María De Lourdes; Uribe-Gutiérrez, Gabriel; Trejo-Hernández, Esmeralda; Gay-Jiménez, Francisco Ramón (Veterinaria México, 2005)