• If your child has had an allergic reaction to eggs or anything that contained egg. • If your child has a history or family history of allergies or of convulsions (fits). • If your child has had a side effect after vaccination with measles, mumps, or rubella (in a single vaccine or combined vaccine, such as the measles, mumps, and rubella vaccine manufactured by Merck & Co., Inc. or ProQuad) that involved easy bruising or bleeding for longer than usual. • If your child has infection with Human Immunodeficiency Virus (HIV) but does not show symptoms of HIV disease.