ESBL-dodatnie i ESBL-ujemne szczepy Klebsiella pneumoniae i Klebsiella oxytoca - wystepowanie w materiale klinicznym i wrazliwosc na wybrane antybiotyki
ESBL-positive and ESBL-negative Klebsiella pneumoniae and Klebsiella oxytoca strains - occurrence in clinical specimens and susceptibility to selected antibiotics