Bacitracin and SXT Susceptibility Tests- Principle, Procedure and Results Interpretation
Introduction Bacitracin susceptibility test and SXT susceptibility test are two different types of tests used to determine the susceptibility of bacteria to certain antibiotics. The Bacitracin susceptibility test is used to determine if a bacterium is susceptible to the antibiotic bacitracin. It involves streaking a pure culture of the bacterium on an agar plate containing bacitracin. If the bacterium is susceptible to bacitracin, there will be a clear zone around the streaked area where the antibiotic has inhibited bacterial growth. The SXT susceptibility test, also known as the co-trimoxazole susceptibility test, is used to determine if a bacterium is susceptible to the antibiotics trimethoprim and sulfamethoxazole (SXT). It involves testing the bacteria's ability to grow in the presence of various concentrations of the antibiotic combination. The minimum inhibitory concentration (MIC) is determined by observing the lowest concentration of the antibiotic that prevents bac...