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Comparison of Compact and Diffuse Variants of Strains of Staphylococcus aureus

机译：金黄色葡萄球菌菌株紧凑型和弥散型变种的比较

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摘要

Several biological characteristics of six diffuse-type variants and six compact-type variants of Staphylococcus aureus were compared on the basis of morphology, phage type, certain cellular products, growth rate, and mouse virulence. All compact variants gave a positive test for clumping-factor reaction, coagulase, deoxyribonuclease, mannitol fermentation, hemolysis, and pigmentation. Four of the six compact variants were phage typable and lacked capsules. None of the diffuse variants was phage-typable or possessed the clumping-factor reaction. Only one diffuse variant had hemolytic activity, and all of the diffuse strains were encapsulated. No differences between the compact and diffuse strains were noted with respect to mannitol fermentation or deoxyribonuclease activity. Coagulase and acid phosphatase activities of the culture supernatant fluid were diminished in most of the diffuse strains. Less β-carotene content was found in cells of diffuse variants. Virulence in mice was found to correlate with the capsule size, as the mortality rate was greatest for diffuse variants having the largest capsules. Growth rates of variants were generally not significantly different.
机译：根据形态，噬菌体类型，某些细胞产物，生长速率和小鼠毒力，比较了金黄色葡萄球菌的六个扩散型变体和六个紧凑型变体的几种生物学特性。所有紧凑型变体均对聚集因子反应，凝固酶，脱氧核糖核酸酶，甘露醇发酵，溶血和色素沉着给出了阳性测试。六个紧凑型变体中有四个是可噬菌体分型且缺乏胶囊。没有一个弥散变异体是噬菌体型或具有聚集因子反应。仅一种弥散变体具有溶血活性，并且所有弥散菌株均被封装。关于甘露醇发酵或脱氧核糖核酸酶活性，没有发现致密菌株和弥散菌株之间的差异。在大多数扩散菌株中，培养上清液的凝固酶和酸性磷酸酶活性降低。在弥散变异的细胞中发现较少的β-胡萝卜素含量。发现小鼠中的毒力与胶囊的大小相关，因为具有最大胶囊的弥散变体的死亡率最高。变体的增长率通常没有显着差异。

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