Not sure if you’re joking but to make safe to eat yogurt, you’ll need to first kill the bad ones by heat, then cool it and once it is barren, you should invite the cool guys in like Lactobacillus bulgaricus, Streptococcus thermophilus, Lactobacillus acidophilus or Bifidobacterium lactis, they’ll need to be kept cosy and warm, and that will give you yogurt.
Not sure if you’re joking but to make safe to eat yogurt, you’ll need to first kill the bad ones by heat, then cool it and once it is barren, you should invite the cool guys in like Lactobacillus bulgaricus, Streptococcus thermophilus, Lactobacillus acidophilus or Bifidobacterium lactis, they’ll need to be kept cosy and warm, and that will give you yogurt.