1. A composition for use in the prevention and / or treatment of viral infections, containing an extract of at least one of the aerial parts of plants of the genus Ribes, while the aerial parts are selected from the group comprising leaves and branches. A composition according to claim 1, characterized in that said viral infection comprises a cold. A composition according to claim 2, characterized in that said cold includes a primary infection caused by rhinoviruses, adenoviruses and / or coronaviruses. The composition according to claim 2 for the treatment of rhinitis. 5. The composition according to claim 1, characterized in that said viral infection includes influenza. A composition according to claim 5, characterized in that said influenza is avian influenza. A composition according to claim 1, characterized in that said viral infection comprises a viral infection caused by retroviruses, preferably caused by exogenous retroviruses. The composition of claim 7, wherein said viral infection causes HIV-1 or HIV-2.9. A composition according to any one of claims 1 to 8, characterized in that said plant is Ribes nigrum L. 10. A composition according to any one of claims 1 to 8, characterized in that said plant is Ribes rubrum L. 11. A composition according to any one of claims 1 to 8, characterized in that said composition also contains an extract of the fruits of said plant of the genus Ribes. 12. A composition according to any one of claims 1 to 8, characterized in that said composition is in liquid, dry or semi-solid form. A composition according to any one of claims 1 to 8, characterized in that said extract is an aqueous extract or an alcoholic extract. A composition according to any one of claims 1 to 8, characterized in that said composition is administered orally1. Композиция для применения при профилактике и/или лечении вирусных инфекций, содержащая экстракт по меньшей мере одной из надземных частей растений рода Ribes, при этом надземные части выбирают из гру
