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为探讨医院内细菌感染的流行病学特点，作者借助临床分离的６４株肺炎克雷伯菌、４５株阴沟肠杆菌和６３株醋酸钙不动杆菌，进行质粒图谱分型。此３种细菌分别有５８株、３５株和４１株含有质粒，且分别构成４６个、２１个和２３个质粒图谱型。结果表明：质粒分析为查明医院内细菌感染的感染源和感染途径提供了较为直接、准确的客观依据，同时也看到了质粒分析的局限性。
In order to explore the epidemiological characteristics of bacterial infections in hospitals, the author used the clinical isolates of 64 strains of Klebsiella pneumoniae, 45 strains of Enterobacter cloacae and 63 strains of Acinetobacter calcoaceticus for plasmid mapping. 58 strains of these three bacteria, 35 and 41 strains contained plasmids, respectively, and constituted 46, 21 and 23 plasmids respectively. The results showed that plasmid analysis provided a more direct and accurate objective evidence for identifying the source of infection and the route of infection in bacterial infections in hospitals, and also saw the limitations of plasmid analysis.