**2. Methods**

3. AD

1. age: 0–6 months and

2. healthy children, without symptoms indicating allergy, who were recruited among patients with suspected infection (UTI-urinary tract infection) or urinary tract disorders (CAKUT-congenital anomalies of the kidney and urinary tract), but which have not been confirmed, or children with FGIDs (functional gastrointestinal disorders), that resolved following standard treatment of symptoms

> and / or with a negative result for elimination tests or oral challenge.

Control group

This is an observational pilot study, constituting part of Stage I of a prospective study.
