CD38 and osteomyelitis: In the B cell group, Memory B cell %B cell (p = 0.035, OR = 1.137, 95%CI = 1.008–1.281); CD20− %B cell (p = 0.037, OR = 1.171, 95%CI = 1.009–1.359); and Memory B cell % lymphocyte (p = 0.013, OR = 1.105, 95%CI = 1.021–1.196) showed a positive causal relationship with the development of osteomyelitis, while Naive-mature B cell %B cell (p = 0.014, OR = 0.863, 95%CI = 0.776–0.971) and IgD- CD38− AC (p = 0.024, OR = 0.831, 95%CI = 0.708–0.976) showed a negative causal relationship with the development of osteomyelitis.