A system for maintaining individual immunization records. The system includes a tracking vehicle storing a first instance of a user record a terminal including an electronic processor and a memory. The electronic processor is configured to communicate with the tracking vehicle, obtain a second instance of the user record stored in the memory of the terminal and determine whether immunization data in the first instance or the second instance is more recent. When the first instance of the user record from the tracking vehicle includes more recent immunization data than the second instance of the user record stored in the memory, the electronic processor is configured to update the user record stored in the memory of the terminal with the more recent immunization data in the first instance of the user record of the tracking vehicle.