hügieenipõhimõte
The hygiene hypothesis suggests that a lack of early childhood exposure to particular microorganisms, such as those found in dirt or animal feces, may lead to an increase in allergic diseases by altering the developing immune system. This hypothesis proposes that the immune system, in the absence of sufficient "training" from diverse microbes, becomes overreactive to harmless substances, leading to conditions like asthma, eczema, and hay fever.
The theory is not about overall cleanliness but specifically about the absence of microbial diversity. Modern
Research supporting the hygiene hypothesis has observed lower rates of allergies in children raised on farms