Significant univariate correlations were found between the number of specific bacteria with thyroid autoimmunity markers like thyroperoxidase antibody (TPO-ab) (positive correlation with Alistipes; Ruminococcaceae unclassified and Enterobacteriaceae, so negative correlation with Faecalibacterium) and thyroid stimulating immunoglobulin antibody (TSI-ab) (positive correlation with Lactobacillus and Pasteurellaceae and negative correlation with Faecalibacterium) (Table 2). This evidence concerns the gene TPO and autoimmune thyroid disease.