巯基乙酸肉汤[注 1]是一种多用途、营养丰富的鉴别培养基。其主要作用是测试微生物对氧含量需求的高低。巯基乙酸钠在培养基中消耗氧气,从而使专性厌氧微生物得以生长[2]。因为巯基乙酸酯钠与从上部往下扩散的氧气结合,所以氧气浓度随深度的增加而降低。

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瓶内装的就是巯基乙酸肉汤(Thioglycollate broth)。瓶内的棉签曾经在外阴部蘸过,放在瓶里的目的是检查该部分是否被厌氧细菌感染。[1]

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