Antibiotic antibiotic therapy. The antibiotic treatment may select for bacterial strains with physiologically or genetically enhanced capacity to survive high doses of antibiotics. Under certain conditions, it may result in preferential growth of resistant bacteria, while growth of susceptible bacteria is inhibited by the drug. For example, antibacterial selection for strains having previously acquired antibacterial-resistance genes was demonstrated in 1943 by the Luria–Delbrück experiment. Antibiotics such as penicillin and erythromycin, which used to have a high efficacy against many bacterial species and strains, have become less effective, due to the increased resistance of many bacterial strains. Resistance may take the form
Antibiotic prophylaxis background, training, nurse and pharmacist influences, medication supply, and logistics. The American Heart Association (AHA) now recommends antibiotic prophylaxis for very few patients since only a small number of cases of endocarditis might be prevented by this procedure. Antibiotic prophylaxis in domestic animal feed mixes has been employed in America since at least 1970. Over time, the use of antibiotics for growth promotion purposes in livestock was discovered. In 1986, some European countries banned the use of antibiotics because of research they found that linked antibiotic use in livestock and drug resistant bacteria in humans. The European Union regulated in