Anaerobic methods for the identification of hæmolytic streptococci

Fry, R. M.

doi:10.1002/path.1700370302

Cited by 33 publications

(8 citation statements)

References 3 publications

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“…Moreover, subcultures were made from colonies and not from single cells. The findings nevertheless are consistent with the observations of Howell (15), Todd (16), and Fry (17), that group A hemolytic streptococcus may give rise to non-hemolytic pathogenic forms. Such variants, unrecognized in the throat flora, furnish a reasonable explanation for the absence of hemolytic colonies from the cultures of children who appeared to be spreading contagion.…”

Section: Biological Characteristics Of Typical Forms Contrasted With supporting

confidence: 92%

The Interaction of Host and Bacterium in the Development of Communicability by Streptococcus Haemolyticus

Coburn

Pauli

1941

Journal of Experimental Medicine

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Studies of the upper respiratory flora in inhabitants of New York City over a period of fifteen years have shown that the prevalence of hemolytic streptococcus has a seasonal trend, which varies little from year to year. If one begins an analysis of the throat flora during the third quarter of the year he finds that hemolytic streptococcus is inactive. Few of these organisms are recovered and they are not virulent. This low carrier rate usually persists into the fourth quarter when sporadic infections occur. Early in the new year there is a steadily rising carrier rate and this is followed or accompanied by a steady increase in acute streptococcal infections. Finally, in the second quarter, the carrier rate and the incidence of infection reach a peak. Infections at this time of year are caused by many serological types of group A organisms, and frequently occur as epidemic outbreaks; however, the presence of hemolytic streptococcus in the throat flora of the general population makes difficult a thorough investigation of these outbreaks. If an isolated epidemic occurs in a season when the carrier rate is low one can identify the sources and trace the spread of infection. We observed such an outbreak during the fall months of 1939 when the carrier rate was low and streptococcal infections rare. This epidemic began in the infants' ward of the Babies Hospital. Since both patients and contacts could be controlled, it was possible to trace the spread and identify the sources of infection. In so doing careful bacteriological studies were conducted. These indicated that certain apparently harmless convalescent babies had the capacity to communicate infection and that this capacity was associated with certain cultural characteristics of the epidemic strain. It is our purpose to describe the epidemic, indicate the sources of infection,

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Section: Biological Characteristics Of Typical Forms Contrasted With supporting

confidence: 92%

The Interaction of Host and Bacterium in the Development of Communicability by Streptococcus Haemolyticus

Coburn

Pauli

1941

Journal of Experimental Medicine

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“…Anaerobic conditions have been recommended for the isolation of betahaemolytic streptococci (Jones et al, 1941 ;Brumfitt and Masters, 1959), and are known to facilitate the development of easily recognisable haemolytic colonies (Fry, 1933). In the present study, the presence of 10 per cent.…”

Section: Discussionsupporting

confidence: 48%

The Influence of Carbon Dioxide on the Growth of Obligate and Facultative Anaerobes on Solid Media

Watt

1973

Journal of Medical Microbiology

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“…The original cultures were made on horse blood agar plates and incubated anaerobically in a McIutosh and Ffldes jar for 16 hours (6,8). Any hemolytic colonies were fished and the cultures purified by plating.…”

Section: Isolation Of the Strainsmentioning

confidence: 99%

The Serological Differentiation of Pathogenic and Non-Pathogenic Strains of Hemolytic Streptococci From Parturient Women

Lancefield¹,

Hare²

1935

Journal of Experimental Medicine

310

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1. The majority of strains of hemolytic streptococci from puerperal infections of the uterus were identified serologically as members of the Group A described by Lancefield. 2. The majority of strains isolated from the birth canal of women whose puerperium was afebrile were not members of Group A. 3. The existence of two new serological groups of hemolytic streptococci, Groups F and G, is described.

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Anaerobic methods for the identification of hæmolytic streptococci

Cited by 33 publications

References 3 publications

The Interaction of Host and Bacterium in the Development of Communicability by Streptococcus Haemolyticus

The Interaction of Host and Bacterium in the Development of Communicability by Streptococcus Haemolyticus

The Influence of Carbon Dioxide on the Growth of Obligate and Facultative Anaerobes on Solid Media

The Serological Differentiation of Pathogenic and Non-Pathogenic Strains of Hemolytic Streptococci From Parturient Women

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