The Swedish study looked at around 1,029 kids aged between seven  to eight in two areas of the nation and included questions on asthma, eczema and rhinoconjunctivitis. The study was held by the International Study of Asthma and Allergies in Childhood questionnaire.

Hand dish washing was associated with a reduced risk of allergic disease development. The risk was further reduced in households where children were served fermented food or food bought directly from farms.

Certain household practices -- including, potentially, the less-efficient method of washing dishes by hand rather than with a dishwashing machine -- may increase microbial exposure. It can induce immunologic tolerance during early life as the study revealed.

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