You Call the Shots Immunization Module: You Call the Shots. Description: You Call the Shots is an interactive, web-based immunization training course. It consists of a series of modules that discuss vaccine-preventable diseases and explain the latest recommendations for vaccine use. Each module provides learning opportunities, self-test practice questions, reference and resource materials, and an extensive glossary. Once you have completed the modules, save your certificate and submit for credit. The course is available free of charge on the CDC Vaccines and Immunizations website at: http://www.cdc.gov/vaccines/ed/youcalltheshots.htm.