Nutritionally variant streptococci from corneal ulcers in horses

Robert Higgins, E. L. Biberstein, S. S. Jang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Of 24 isolates of nutritionally variant streptococci recovered from equine corneal ulcers, 22 were tested for growth requirements, physiological and biochemical reactions, and susceptibility to different antimicrobial agents. Satisfactory growth was obtained by supplementing blood agar and Todd-Hewith broth with pyridoxal hydrochloride, and all of the media for the culture and the biochemical testing were supplemented with 0.002% of this substance. Biochemical patterns of 12 of the isolates resembled those of two viridans streptococcal species, Streptococcus intermedius and Streptococcus constellatus. Patterns of 10 isolates did not resemble those of any recognized viridans species. All of the isolates were inhibited by ≤0.25 μg of erythromycin per ml, ≤4 μg of chloramphenicol per ml, and ≤4 μg of gentamicin per ml, and all but two were inhibited by ≤0.1 μg of penicillin per ml.

Original languageEnglish (US)
Pages (from-to)1130-1134
Number of pages5
JournalJournal of Clinical Microbiology
Issue number6
StatePublished - Dec 1 1984
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology (medical)


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