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This answer focuses primarily on allergies, for which there is more reliable research, but touches on general immunity towards the end. It is certainly true that the prevalence of allergies is increasing worldwide, and seems to be related to a rise in the so-called 'modern lifestyle' which avoids exposure to potentially harmful environmental factors. The ...


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I can't think of any pathogenic organisms that are completely resistant to the immune system. Some bacteria that cause chronic diseases (e.g. tuberculosis) are relatively resistant, and a handful of viruses (e.g. spumaviruses) are relatively invisible, but the nature of pathogen transmission would mean that completely resistant organisms would spread through ...


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