Vehicles of contamination help micro-organisms move from one place to another and hence can be a route for contamination.
Of the listed options, Blast Chillers are not vehicles of contamination. Blast Chillers are a bit like advanced freezers because they are used to freeze food at a fast rate. This ensures that food does not remain in the "<em>danger zone temperature of contamination</em>" - <em>period between temperature food is cooked at and temperature it cools at</em>".
As a result of this rapid freezing, items inside a blast chiller stand a way smaller chance of being contaminated as the low temperatures hamper bacterial growth.
Occupational Safety and Health Administration, Environment Protection Agency, Centers for Medicare and Medical Services, and Health and Human Services.
