Question: what is the difference between varicella and zoster vaccines?
Answer: A dose of varicella vaccine has 1,350 plaque forming units (PFUs) of varicella vaccine virus, MMRV contains 9,800 PFUs (7 times higher than varicella vaccine), and live zoster vaccine contains 19,400 PFUs (14 times higher than varicella vaccine) at the date of expiration.