Careful, that's not really been proven. There's an enormously important difference between these two theories:
1. The individual human immune system needs to be calibrated by wider exposure to... actual pathogens.
2. The individual human immune system needs to be calibrated by wider exposure to... benign bacteria that we've co-evolved with. ("Old friends" [0].)
Those involve very different plan of treatment and associated risks, and there's no guarantee the riskier one will give better results.
[0] https://www.news-medical.net/health/Old-Friends-Hypothesis.a...
Careful, that's not really been proven. There's an enormously important difference between these two theories:
1. The individual human immune system needs to be calibrated by wider exposure to... actual pathogens.
2. The individual human immune system needs to be calibrated by wider exposure to... benign bacteria that we've co-evolved with. ("Old friends" [0].)
Those involve very different plan of treatment and associated risks, and there's no guarantee the riskier one will give better results.
[0] https://www.news-medical.net/health/Old-Friends-Hypothesis.a...