Patienthèque of Finisterian (South of Brittany) Children With Cystic Fibrosis in the Time of Precision Medicine

Who May Qualify: - Newly screened infants with a confirmed diagnosis of cystic fibrosis in its classic form (clinical symptoms and two positive sweat tests and/or two mutations of the cftr gene from Class I to III) - Children free of any colonization with P. aeruginosa - Affiliation with the social security system - Consent signed by the holders of parental authority or the sole parent holding parental authority Who Should NOT Join This Trial: - Children colonized with P. aeruginosa according to the cytobacteriological examination and / or molecular test of sputum or pharyngeal specimens - Children grafted - Children not affiliated to a social security scheme or not entitled to - Children whose parent (s) are (are) minor (s) - Children whose holders of parental authority do not master the French language - Refusal to participate in the study Always talk to your doctor about whether this trial is right for you.