Spurious Ampicillin Resistance by Testing Haemophilus influenzae with Agar Containing Supplement C | Zendy

John A. Washington | Zendy; Robert Snyder | Zendy; Peggy C. Kohner | Zendy

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Spurious Ampicillin Resistance by Testing Haemophilus influenzae with Agar Containing Supplement C

Author(s) -

John A. Washington,

Robert Snyder,

Peggy C. Kohner

Publication year - 1976

Publication title -

antimicrobial agents and chemotherapy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.07

H-Index - 259

eISSN - 1070-6283

pISSN - 0066-4804

DOI - 10.1128/aac.9.1.199

Subject(s) - ampicillin , haemophilus influenzae , microbiology and biotechnology , agar , amp resistance , haemophilus , minimum inhibitory concentration , agar plate , agar dilution , medicine , biology , antibiotics , bacteria , genetics

Ampicillin resistance (minimal inhibitory concentration >/=10 mug/ml) in the absence of beta-lactamase activity by Haemophilus influenzae was noted in tests performed with Mueller-Hinton agar containing one lot of supplement C. All strains, except five with known resistance due to beta-lactamase activity, were inhibited by 0.6 mug or less of ampicillin per ml of chocolatized blood agar.

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