Spinal cord section showing the white and the gray matter in four spinal cord levels. The gray matter mainly contains the cell bodies of neurons and glia and is divided into four main columns: dorsal horn, intermediate column, lateral horn and ventral horn column.
Merck's Patient Assistance Programs to Help Those in Need. Contact Us. If you have any general questions about the Merck patient assistance programs, please call 1-800-727-5400, Monday through Friday, 8 AM to 8 PM EST. For contact information about a specific program, please refer to the program information on the Programs page.
CDC-INFO Contact Center. Call this toll-free number to request information on immunization. The number is (800) 232-4636 (800-CDC-INFO). This is an integrated CDC hotline service. Callers to this number are given several options, one of which is immunization. This line will accommodate English and Spanish. CDC's National Center for Immunization and Respiratory Diseases Hotline TTY Service