It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
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更重要的是，这里的医护人员，能和患者建立长期稳定的关系，工作有成就感；再加上宜居的生活环境，很多医护人员一旦入职，就愿意长期留下来。，这一点在爱思助手下载最新版本中也有详细论述