Commensal Relationship between Group A Streptococci and Neisseria Subflava

M. Abbaszadegan, W. P. Applegren, M. Pessarakli

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This study was carried out in a laboratory to examine the relationship between group A streptococci and Neisseria subflava. The study consisted of the following: 1. A comparison of the growth of streptococci in pure versus mixed culture. 2. The addition of cell-free extracts from the Neisseria cultures as supplements to the streptococci growth media. 3. The addition of measured quantities of riboflavin in the Streptococcus culture medium. The results of this investigation show that the presence of Neisseria subflava in a mixed culture enhances the growth of Streptococcus pyogenes. The group A streptococci are capable of causing clinical infection of the throat or skin in man. As a consequence, individuals having Neisseria subflava within their normal throat flora may be more susceptible to Streptococcal throat infections. The study of the interaction of the Neisseria-Streptococcus indicates that in the presence of Neisseria subflava the generation time of Streptococcus pyogenes is significantly decreased. It appears that the growth of Neissena subflava in the environment furnishes the nutritional factor riboflavin (vitamin B2) which is responsible for lowering the generation time of the group A streptococci.

Original languageEnglish (US)
Pages (from-to)259-276
Number of pages18
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Issue number1
StatePublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Engineering


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