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Child microbiome can be associated with autoimmune diseases, such as type 1 diabetes (T1D). We collected vaginal DNA samples from 25 mothers with a vaginally delivered child diagnosed with T1D and samples from 24 control mothers who had vaginally delivered a healthy child and analyzed bacteriome and mycobiome of the samples. The total DNA of the samples was extracted, and ribosomal DNA regions (16S for bacteria, ITS2 for fungi) were amplified, followed by next-generation sequencing and machine learning. We found that alpha-diversity of bacteriome was increased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.002), whereas alpha-diversity of mycobiome was decreased (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.001) in mothers with a diabetic child compared to the control mothers. Beta-diversity analysis suggested differences in mycobiomes between the mother groups (<jats:italic>P<\/jats:italic>\u2009=\u20090.001). Random forest models were able to effectively predict diabetes and control status of unknown samples (bacteria: 0.86 AUC, fungi: 0.96 AUC). Our data indicate several fungal genera and bacterial metabolic pathways of mother vaginal microbiome to be associated with child T1D. We suggest that early onset of T1D in a child has a relationship with altered mother vaginal\u00a0microbiome and that both bacteriome and mycobiome contribute to this shift.<\/jats:p>","DOI":"10.1007\/s00430-022-00741-w","type":"journal-article","created":{"date-parts":[[2022,6,14]],"date-time":"2022-06-14T16:40:52Z","timestamp":1655224852000},"page":"185-194","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Child type 1 diabetes associated with mother vaginal bacteriome and mycobiome"],"prefix":"10.1007","volume":"211","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6621-0375","authenticated-orcid":false,"given":"A. 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