The Bile Solubility Test

Bile will selectively lyse colonies of Streptococcus pneumoniae while other strep are immune to bile's activity. When a bile salt such as desoxycholate is added directly to Streptococcus pneumoniae growing on an agar plate or in a broth culture the bacteria will lyse and the area become clear. Other alpha-hemolytic streptococci are resistant to (not lysed by) bile and will stay visible or turbid (cloudy).

48 肺炎鏈球菌（Streptococcus pneumoniae）可用下列何種方法鑑定？

 尿素酶試驗（urease test）  膽汁溶解試驗（bile solubility test）

 錫克氏試驗（Schick test）  氧化酶試驗（oxidase test）