Varicella zoster virus (Oka/ Merck) vivum, attenuatum ≥ 19 400 PFU * * PFU = Plaque- forming units
Virus varicella- zoster, sev Oka/ Merck, (živi, oslabljen) ≥ 19. 400 PFU * * PFU (Plaque- forming units) = enote, ki tvorijo plak