Abstract
Summary and Conclusions
Two hitherto undescribed antigenic types of S. alkalescens have been reported. The representative strains have the morphological, cultural, and biochemical characteristics of S. alkalescens type I and do not share major antigenic components either with each other or with types I and II. One of the strains was isolated by Captain Ewing, the other at this laboratory. At the present time, therefore, S. alkalescens comprises 3 antigenic types, namely, type I composed of 4 sub-types, and the 2 new types described here. It is doubtful whether type II of Assis will ultimately be classified as S. alkalescens.
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