Isolation and identification of pandemic influenza virus H1N1/2009 S-OIV from commercial and backyard swine in Costa Rica. Cienc. vet. [Internet]. 2014 Jun. 22 [cited 2024 Dec. 19];29(2):57-85. Available from: https://www.revistas.una.ac.cr/index.php/veterinaria/article/view/6040