Forekomsten og typen af bivirkninger, som sås i den forsøgsgruppe, der fik ProQuad, svarede generelt til forekomsten i de grupper, der fik levende skoldkoppevaccine (Oka/ Merck) og MFR- vaccinen fremstillet af Merck & Co., Inc.
The rates and types of adverse reactions seen in the study group that received ProQuad were generally similar to those seen in the groups that received Varicella Vaccine live (Oka/ Merck) and the measles, mumps, and rubella vaccine manufactured by Merck & Co., Inc.