DIFFERENTIATION OF HEMOLYTIC STREPTOCOCCI OF HUMAN AND OF DAIRY ORIGIN BY METHYLENE BLUE TOLERANCE AND FINAL ACIDITY

Author:

Avery Roy C.1

Affiliation:

1. From the Department of Bacteriology and Immunology, School of Medicine, Vanderbilt University, Nashville, Tennessee

Abstract

A grouping of 138 strains of hemolytic streptococci based on differences in dye-sensitiveness and in final hydrogen-ion concentration of cultures is presented. Three groups are distinguished; (1) human parasitic strains, defined by a final pH range of 5.2 to 5.0 and by failure to reduce methylene blue (1:5000) in milk, (2) bovine strains parasitic in the udder, characterized by a final pH range of 4.5 to 4.2 and by failure to reduce methylene blue (1:5000) in milk, (3) saprophytic strains, characterized by a final pH range of 4.5 to 4.2 and by ability to reduce methylene blue. Methylene blue was bactericidal for the strains of hemolytic streptococci that fail to reduce it, but neither bacteriostatic nor bactericidal for the strains that caused its reduction.

Publisher

Rockefeller University Press

Subject

Immunology,Immunology and Allergy

Cited by 25 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. THE DEVELOPMENT OF A PHAGE-TYPING SYSTEM FOR GROUP-B STREPTOCOCCI;Journal of Medical Microbiology;1980-02-01

2. Septicaemia in Vervet Monkeys Caused by Streptococcus Ptogenes;Journal of Comparative Pathology and Therapeutics;1960-01

3. STUDIES ON THE STREPTOCOCCI ("ENTEROCOCCI") OF LANCEFIELD GROUP D;American Journal of Diseases of Children;1945-08-01

4. STUDIES ON A NON-HEMOLYTIC STREPTOCOCCUS ISOLATED FROM THE RESPIRATORY TRACT OF HUMAN BEINGS;Journal of Experimental Medicine;1944-11-01

5. Human Scarlatinal Streptococci in Monkeys;Journal of Bacteriology;1940-06

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