A group of young scientists visited a Nursery to study the level of sanit ion and the conformity to the hygiene rules and regulations. They adopted a test aiming at detecting the contamination with E. coli. For that purpose, they asked the toddlers who used the toilet's room to put their fingers on a Petri dish containing a nutritive medium. To their surprise, the bacteria did nor grew. Justify this finding? Indicate the name of the immune system component that would stands behind this finding? E. coli

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