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I axed, you answered. Thanks.Astronuc said:I wouldn't consider yogurt starting as spoiled milk. http://www.milkfacts.info/Milk Processing/Yogurt Production.htm
Spoiling involves other bacteria, which are often harmful, e.g., E. coli, other strep or staph bacteria, and others that may produce toxins or other serious illness in people or animals.
Lactobacillus delbrueckii is another fermenting bacterium.
https://academic.oup.com/nutritionreviews/article/79/5/599/5843523