Based on mice research but at least sounds interesting. https://neurosciencenews.com/stress-vaccine-9279/
A mostly BS prediction: there will be a high correlation of that 'anti-stress' bacteria already existing in sociopaths.
way to simplistic biochemistry that has taken millions of years to develop can not be simplified to this extent by wishful thinking . stress is a natural part of living who knows how many serious complications will arise from tinkering with one or two different pathways. we need a far more complete understanding of human biology on the macro scale than is presently available .
This is the risk, instead of understanding emotions and learning what they are trying to tell us we want to become a society of fast food and buried wisdom. Feel depressed, why doesn't matter, take a pill, feel stressed, instead of fixing the cause you can wash it away instead. Easy answers are the only answers you need...