Hopefully the original poster is still receiving updates to this post, I'm curious to know how he/she made out.
I recently followed the instructions mentioned above for soy milk but used regular bio milk. I also used Mutaflor in suspension form. It worked perfectly. It took a little longer than my regular yogurt to solidify but after about
12hrs there it was. Looked like yogurt, smelled like yogurt and tasted like yogurt.
I was also confused because E. coli is not a lactic acid producing bacteria as you point out. But, after some digging I found that it can proliferate in milk (both the good and bad strains) and can produce lactate. But it can produce a bunch of other things as well including CO2 and hydrogen. I did notice on the second day that the yogurt was forming small bubbles suggesting it was producing gas.
But I'm still a little apprehensive to eat too much but after two breakfasts I feel completely fine.
Technically this wouldn't be considered yogurt as to be called yogurt the product must contain lactobac bulgaris and streppococcus thermophilus. I'd be curious if anyone knows what this would be called, if not yogurt.
Post Edited (Mendus) : 11/13/2017 1:55:33 PM (GMT-7)