Strachan's hygiene hypothesis states that exposure of younger children to infectious agents already contracted by older children in the family confers protection against the development of allergic conditions such as eczema, hay fever, and asthma.

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The hygiene hypothesis, proposed by David P. Strachan, suggests that early exposure to microbes and infections can help the immune system develop properly, reducing the risk of allergies and autoimmune diseases.

Strachan's Hygiene Hypothesis States That Exposure of Younger Children to Infectious