The present comparative study of throat and milk streptococci was undertaken with the object of establishing a method for distinguishing between organisms isolated from these two sources. Much confusion has existed as to the relationships within this genus. The introduction of the biometric study of the streptococci according to their reaction in various carbohydrate mediums by Gordon (1904-1905) and the subsequent extension of the study by Houston (1905-1906) seemed to give a method of solving this obscure problem. The English results have been obtained by the use of litmus added to the mediums and the reactions recorded as positive or negative according to the color of the litmus, without titration. If the mediums were not neutral at the start, it is obvious that they must have classified many organisms as fermentors which have only very slight fermentative properties and really belong to the non-fermenting group. Winslow has pointed out that
STOWELL EC, HILLIARD CM. A COMPARISON OF THE STREPTOCOCCI FROM MILK AND FROM THE HUMAN THROAT. Am J Dis Child. 1912;III(5):287–293. doi:10.1001/archpedi.1912.04100170012002
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