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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.
What is 'Beta'. Beta is a measure of the volatility, or systematic risk, of a security or a portfolio in comparison to the market as a whole. Beta is used in the capital asset pricing model (CAPM), which calculates the expected return of an asset based on its beta and expected market returns. Beta is also known as the beta coefficient.