Isnt your stomach acid basically around pH2 and it would kill all the bacteria?
In: Biology
There are species of bacteria that can survive extreme pH levels, e.g. acidophilic bacteria that produces vinegar can thrive in a pH below 4.0 and even survive down to pH 0.
Bacteria in yoghurt, ([lactobacilli](https://www.sciencedirect.com/topics/food-science/lactic-acid-bacteria) has a optimum pH of ~4), depending on which species of lactobacillus can survive the pH 2. Here’s a [study](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1151822/) done on lactobacillus’ survival in gastric acid.
Certain bacterial species may also be pathogens, e.g. Helicobacter pylori, which causes 90% of duodenal ulcers and 80% of stomach ulcers([sauce](https://www.cdc.gov/ulcer/keytocure.htm)).
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