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ESBL stands for Extended-Spectrum beta-Lactamase. Beta lactamases are enzymes that are produced by many types of bacteria (germs) which make them more resistant to antibiotics and can make the infection harder to treat.
The term ESBLs is commonly used to refer to bacteria that produce Extended Spectrum Beta-Lactamase enzyme. ESBLs are resistant to most types of antibiotics (third generation). The majority of ESBL producing strains are either klebsiella pneumoniae (K. pneumoniae), klebsiella oxytoca (K. oxytoca) and Escherichia coli (E. coli).