Children have come to our office with an illness that we have nicknamed "orthodontic parotitis." It is an atypical parotitis associated with signs of irritation of the outlet of the parotid duct in the presence of a bracket projecting laterally toward the duct from a band around an upper molar tooth. Only five cases have appeared in six years of pediatric practice, and two of them have provided an opportunity for fuller observation, including virus isolation and serologic studies done by the Viral and Rickettsial Disease Laboratory of the California Department of Health, courtesy of Edwin H. Lennette, MD, PhD.
Report of Cases.—Case 1.—A 12-year-old boy with Down syndrome had received orthodontic treatment for five years. He had been inoculated with mumps vaccine 20 months before this episode and was exposed to mumps three weeks before. He suddenly developed swelling below the left ear and worsening of his