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Group Q Streptococci II. Nutritional Characteristics and Growth Relationship to Thymine, Folate, and Folinate

^a Microbiology Section, Division of Biological Sciences, and Department of Food Science, College of Agriculture, Cornell University, Ithaca, New York 14851

ABSTRACT

The vitamin requirements of the group Q streptococci (Streptococcus avium) and the established enterococcal species (S. faecalis and S. faecium) paralleled one another, although S. avium did not characteristically require riboflavine or pyridoxal. S. avium was further differentiated in that it required thymine for growth initiation whether or not folate was present. Folate was stimulatory in the presence of sub-optimal concentrations of thymine, as well as during the early growth period with optimal thymine concentrations. Folinate completely replaced the thymine requirement, and the S. avium strains required significantly higher concentrations than did Pediococcus cerevisiae 8081. The requirement pattern for folate and related compounds was compared, and marked differences were observed in the requirements of S. faecalis, S. faecium, S. avium, and P. cerevisiae.

¹ Present address: Fisheries Research Board of Canada, Technological Laboratory, Halifax, Nova Scotia.

² Present address: Department of Bacteriology, The University of Wisconsin, Madison, Wis. 53706.