EBF1 and Alzheimer disease: Mucosal microbiome composition differed by HIV status but not MSM status (Fig. S7A; Table S5).AD-associated changes in low-abundance genera were observed, including reductions in Peptoniphilus_A, Onthomonas, VUNA01, and increases in Pseudobutyricicoccus in HIV(+)MSM, as well as overall increases in Pseudobutyricicoccus and COE1 and reductions in VUNa01 and RUG13077 on the AD as determined by unstratified analysis (Fig. S7B and C; Tables S6 and S7).