Fiecare om este „locuit” de sute de mii de tipuri diferite de microbi şi bacterii. Aceste microorganisme aduc cu ele aproximativ 8 milioane de gene diferite, cu mult mai numeroase decât cele 22.000 de gene care alcătuiesc genomul uman. În cadrul studiului, echipa de cercetători a adunat mostre de la 242 de adulţi sănătoşi, cu vârsta între 18 şi 40 de ani, din Houston şi Saint Louis. De la fiecare persoană au fost recoltate bacterii din 15 până la 18 „habitate” specifice – 9 din gură, 4 de pe piele, unul din nas şi trei din zona organelor genitale la femei, precum şi din materiile fecale.
„Ne trebuie un sistem de referinţă pentru ceea ce este normal, pentru a putea să judecăm ceea ce este anormal”, a declararat miercuri, într-o conferinţă de presă, Eric Green, director al Institutului Naţional pentru Studiul Genomului Uman din SUA.
Fiecare dintre persoanele care au participat la studiu au un microbiom relativ diferit, ceea ce înseamnă că nu există un singur tip de microbiom „sănătos”.
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