Have you ever thought that hygiene can harm your child's immunity? Since childhood, we are accustomed to the fact that bacteria? our enemies, and we also raise our own children. But what is more harmful? microbial medium or sterile purity? Before you is a revolutionary book about how to properly raise and educate a child in order to form a strong immunity for him? from leading Western microbiologists. Marie-Claire Arrieta and B. Brett Finlay argue that timely contact with various bacteria reduces the risk of a child developing diseases such as asthma, diabetes, obesity in the future. What to do? stay away from pets; wash and boil children's toys; wash pens with soap...... or still let your child immerse themselves in a microbial environment?