BRD2 and infection: A total of 2175 Dalian blood donor samples were tested for anti-HDV antibodies, including 65/263 (24.7%) pre-donation HBsAg-reactive samples; 1017 samples confirmed HBV-infected after donation, including 507/519 (97.7%) HBsAg+/HBV DNA+, 33/33 (100%) HBsAg+/HBV DNA-, and 477/508 (93.9%) HBsAg−/HBV DNA+ (451 OBIs and 26 WP infections); 327/368 (88.9%) NAT NDR samples; and 766 samples comprising 397 anti-HBc+-only and 369 anti-HBs+-only qualified donations (Table 1 and Table 2).