Børn, som fik ProQuad i alderen 4- 6 år efter primær immunisering med levende skoldkoppevaccine (Oka/ Merck) og MFR- vaccinen fremstillet af Merck & Co., Inc.
Children who received ProQuad at 4 through 6 years of age after primary immunization with Varicella Vaccine live (Oka/ Merck) and the measles, mumps, and rubella vaccine manufactured by Merck & Co., Inc.