A battle is waging about how often and how carefully we should wash our hands. Many allergy experts say it is vital for our future health and that of our children to reduce hand washing and allow friendly microbes back into our mouths. Some authors go as far as urging us to eat dirt. But other experts, such as those working on infectious diseases, say this is highly irresponsible and dangerous advice because of the recent rise in cases of food poisoning and transmission of viruses.
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