resistance of bacteria evolution 1943 penicillin and erythromycin evolutionary processes survive high doses of antibiotics 1943 Luria–Delbrück
What is a modern common occurence with antibiotics? What is resistance to antibiotics a cause of? When was the Luria-Delbruck experiment? Which two antibiotics that have high efficacy are much less useful now? What does emergence of resistance reflect? What is the purpose of antibiotic treatment? When was antibacterial-resistance demonstrated? Who made the demonstration in 1943?
The emergence of resistance of bacteria to antibiotics is a common phenomenon. Emergence of resistance often reflects evolutionary processes that take place during 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.
question: What is a modern common occurence with antibiotics?, answer: resistance of bacteria | question: What is resistance to antibiotics a cause of?, answer: evolution | question: When was the Luria-Delbruck experiment?, answer: 1943 | question: Which two antibiotics that have high efficacy are much less useful now?, answer: penicillin and erythromycin | question: What does emergence of resistance reflect?, answer: evolutionary processes | question: What is the purpose of antibiotic treatment?, answer: survive high doses of antibiotics | question: When was antibacterial-resistance demonstrated?, answer: 1943 | question: Who made the demonstration in 1943?, answer: Luria–Delbrück