Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
virulent [ˈvɪrulənt] adj (poison) ядови́тый; (disease) смерте́льный; (actions, feelings) по́лный*по́лон не́нависти
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.