Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
immunize [ˈɪmjunaɪz] vt (MED)
to immunize (against)привива́ть (приви́ть*perf) (про́тив +gen)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.