From the University of Pennsylvania, Philadelphia, PA.
Accepted for publication December 04, 2012.
S.A.P. is a paid consultant to many vaccine manufacturers but has no conflict of interest in relation to mumps vaccines. The author has no other funding or conflicts of interest to disclose.
Address for correspondence: Stanley A. Plotkin, MD, 4650 Wismer Road, Doylestown, PA 18902. E-mail: Stanley.Plotkin@Vaxconsult.com.