Results None of pathogenic bacteria was isolated and HBsAg was negative, but the excessive total bacterial count was found in 3 samples from endoscopy, dissecting forceps and water respectively.

• 结果所有31份样品均未检出致病菌,乙肝表抗全部为阴性,部分胃镜镜身、活检钳和注水细菌总数过高。