To grasp the resistance of pathogenic bacteria in scaled farms of Guizhou province,97 strains including Escherichia,Salmonella,Staphylococcus,Streptococcus were isolated from the air,sewage water,faecal and soil samplesin six scaled farms of three areas,and the drug sensitivity was performed.The results showed that the four bacterias had wide-ranging drug resistance and multi-resistance,of which Escherichia and Salmonella were prominent,The lowest sensitive drugs were penicillin,tetracycline,lincomycin,eryt...