Bovine enteroviruses were first classified into two main groups on a serological basis. The ability to grow in the presence of 5 mug/ml of 2(alpha-hydroxybenzyl)-benzimidazole (HBB) has been reported to be characteristic of the strains belonging to group I. Twenty-six strains isolated in Algeria and previously serologically grouped were submitted to the action of GBB. The viruses of our group I (similar to La Placa's group I) exhibited the same propertie, whereas the strains of our group II were inhibited by GBB as are the strains belonging to La Placa's group II.