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Table 5 Quantitative β-lactamase activity, nitrocefin test and presence of blaZ in randomly selected clinical isolates of BIVR and non-BIVR

From: Low level β-lactamase production in methicillin-resistant staphylococcus aureus strains with β-lactam antibiotics-induced vancomycin resistance

Phenotype blaZ Nitrocefin test β-lactamase (μmol/min/mg protein)
    Range Average ± STD
BIVR
(n = 5)
- - <1 × 10-4 <1 × 10-4
Non-BIVR (n = 10) + + 1.03 × 10-3 – 4.48 0.79 ± 1.84
Non-BIVR (n = 10) + - 2.76 × 10-4– 2.13 × 10-2 7.28 × 10-3 ± 1.25 × 10-2