The generations of the vaccines: Case of gastrointestinal antiparasitic vaccines used in Veterinary Medicine . Rev Sist Prod Agroecol. [Internet]. 2021 Dec. 15 [cited 2026 Sep. 14];12(2):74-96. Available from: https://ojs-unillanos-prueba.metarevistas.org/index.php/sistemasagroecologicos/article/view/879