Varicella- zoster- virus, Oka/ Merck- stamme, (levende, attenueret) ≥19400 PFU * * PFU = Plaqueformende enheder
Virus del Varicella-zoster, ceppo Oka/ Merck, (vivo, attenuato) ≥ 19.400 PFU* *PFU = Unità formanti-placca