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Sensitivity of Citrobacter freundii and Citrobacter koseri to cephalosporins and penicillins
  1. B. Holmes,
  2. Anna King,
  3. I. Phillips,
  4. S. P. Lapage
  1. National Collection of Type Cultures, Central Public Health Laboratory, London
  2. Department of Microbiology, St Thomas's Hospital Medical School, London


    An examination of 99 field and reference strains of Citrobacter freundii showed 79% of them to be resistant to cephaloridine and sensitive to carbenicillin, while 96% of 45 field and reference strains of Citrobacter koseri examined were sensitive to cephaloridine and resistant to carbenicillin. Susceptibility tests with these two antibiotics are therefore useful in separating the two species of Citrobacter.

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