Background Previous studies have identified a diverse group of microbial taxa that differ between patients with multiple sclerosis (MS) and the healthy population. However, interpreting findings on MS-associated microbiota is challenging, as there is no true consensus. It is unclear whether there is gut microbiota commonly altered in MS across studies. Methods To answer this, we performed a meta-analysis based on the 16S rRNA gene sequencing data from seven geographically and technically dive...| BioMed Central