Antibiotic susceptibility refers to the ability of bacteria to be inhibited or killed by specific antibiotics. When a bacteria is susceptible, it means that the antibiotic can effectively treat an infection caused by that bacteria. This is determined through laboratory tests that measure how well different antibiotics can stop the growth of bacteria. Understanding antibiotic susceptibility is crucial for effective treatment of infections. If a bacteria is resistant to an antibiotic, it will not respond to that treatment, making infections harder to manage. This resistance can develop due to overuse or misuse of antibiotics, highlighting the importance of responsible antibiotic use.