Table 1. Comparison of MMRV, MMR and Varicella (Var.) Vaccines by manufacturer.

Manufacturer	GlaxoSmithKline (GSK) Inc.			Merck Inc.
Vaccines	MMR (PriorixTM)	Var. (VarilrixTM)	MMRV (Priorix-TetraTM)	MMR (MMR-IITM)	Var. (Varivax-IIITM)	MMRV-U.S. (ProQuadTM)
Authorized for use in Canada	Yes	Yes	Yes	Yes	Yes	No**
Measles strain	Schwarz ≥ 3,3 log10 CCID50	Nil	Schwarz ≥ 3.0 log10 CCID50	Enders (Edmondston) ≥ 3.0 log10 CCID50	Nil	Enders (Edmondston) ≥ 3.0 log10 TCID50
Mumps strain	RIT4385JL* ≥ 3.7 log10 CCID50	Nil	RIT4385 JL ≥ 4.4 log10 CCID50	JL (B level) ≥ 3.7 log10 CCID50	Nil	JL ≥ 4.3 log10 TCID50
Rubella strain	Wistar RA 27/3 ≥ 3.0 log10 CCID50	Nil	Wistar RA 27/3 ≥ 3.0 log10 CCID50	Wistar RA 27/3 ≥ 3.0 log10 CCID50	Nil	Wistar RA 27/3 ≥ 3.0 log10 TCID50
Varicella strain	Nil	Oka ≥ 3.3 log10 PFU	Oka ≥ 3.3 log10 PFU	Nil	Oka-Merck ≥ 3.13 log10 PFU	Oka-Merck ≥ 3.99 log10 PFU
Age group	≥ 12 mos.	≥ 12 mos.	≥ 9 mos.*** - 6 years of age****	≥ 12 mos.	≥ 12 mos.	12 mos.–12 yrs.
Storage	Refrigerator	Refrigerator	Refrigerator	Refrigerator	Refrigerator	Freezer

* JL = Jeryl Lynn mumps vaccine strain. ** ProQuad^TM is not authorized in Canada as of September 2009 (shown here to allow comparison of the minimum potencies of vaccine antigens). *** Authorized for use at 9 to 11 months of age, but not recommended by NACI. **** May be used in individuals up to 12 years of age based upon previous experience with separate component vaccines Priorix^TM and Varilrix^TM.