Objective To study the effects of four kinds of mineral dusts from different place in our country on the Escherichia coli,Staphylococcus epidermidis and Streptococcus mitis.

• 目的观察4种矿物粉尘对人体大肠埃希菌、表皮葡萄球菌、缓症链球菌等3种正常细菌的影响。