<p>Phylogenetic diversity, an alpha diversity measure of bacterial richness, is shown according to carrier status of the AH8.1 haplotype (left), as well as the pre-defined HLA genotype groups (right, AH8.1 homozygotes, i.e. homozygosity for both HLA-B*08 and HLA-DRB1*03; AH8.1 heterozygotes, i.e. at least 1 copy of HLA-B*08 and HLA-DRB1*03; Non AH8.1 heterozygotes, i.e. HLA-B*08 and HLA-DRB1*03 both not present. Non AH8.1 homozygotes, i.e. HLA-DRB1 homozygous but non AH8.1). There were no significant differences between the groups.</p
