How should MMRV (ProQuad) be used?

ProQuad was licensed in 2005 for use in children ages 12 months through 12 years. It combines the measles-mumps-rubella (MMR) and varicella vaccines and therefore can be used in place of the individual MMR and varicella vaccines given at ages 12–15 months and 4–6 years. For more information, consult the package insert at www.merck.com/product/usa/pi_circulars/p/proquad/proquad_pi_4171.pdf.