At the creamery, students test milk from the dairy to make sure its fat and protein ratio is just right for cheese. They also heat up the milk to get rid of any bad bacteria – it’s a process called pasteurization.
Not all bacteria are bad, though. In fact, some bacteria are really helpful for making foods, including yogurt, pickles – and cheese.
Read all of this answer from Dr. Universe at https://askdruniverse.wsu.edu/2016/07/31/cheese-what-exactly-is-it/.
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