"Like many scientists, I believe that excessive hygienisation of life is responsible for the development of allergies. We avoid contact with microorganisms. Our children live in almost sterile conditions, we wash our hands every now and then. Our immune system hardly comes into contact with bacteria, but it is still in contact with other antigens. So, if the organism gets bored, these other antigens, completely harmless – a protein of milk, fish, or even strawberries – start to be treated as enemies."