Prevalence of vaginitis
A total of 1103 women were enrolled in the study, and 1075 women were finally enrolled according to the completeness of pregnancy outcome. Among 1075 women in the third trimester of pregnancy, 868 (80.7%) women were normal without vaginitis, and 207 (19.3%) women had vaginitis, including 163 (15.2%) women with single vaginitis and 44 (4.1%) women with mixed vaginitis. In women with single vaginitis, there were 88 (8.2%) women with single VVC, 42 (3.9%) women with single BV, 31(2.9%) women with single AV, and 2(0.2%) women with single TV. Among women with mixed vaginitis, there were 20 (1.9%) women with AV+BV, 11 (1%) women with VVC+BV, 12(1.1%) women with VVC+AV, and 1(0.1%) woman with AV+TV(Table S1).