SUMMARY: The ability of the L-form of two strains of group A streptococci to pass filters was assessed by several methods. From a comparison of the results, and taking into account the plasticity of the L elements, it is concluded that the size of the reproductive elements of the L-form of the group A streptococcal strains investigated probably lies between 0·45 μ and 0·65 μ. The passage of the elements through filters with pores measuring 0·45 μ or less in diameter may be explained by the ease with which the elements are deformed. The variation between the results obtained with different filtration methods can be attributed to differences in experimental conditions which affect the degree of deformation.


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