La primavera la sangre altera

The video explains allergies as exaggerated immune responses to harmless substances, influenced by environmental factors and cleanliness. It discusses the hypothesis that a lack of exposure to bacteria and viruses in clean environments may lead to allergies. The prevalence of allergies varies between developed and developing countries, and urban and rural areas. Rare allergies, such as those to water and sunlight, are highlighted, along with a case study on semen allergy treatment. The video concludes by suggesting that spring affects the immune system.

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