Why does antibiotic resistance occur?
How does misuse of antibiotics contribute to antibiotic resistance?
What is one way to prevent antibiotic resistance?
A population of bacteria is exposed to an antibiotic that is effective against them. After several weeks, researchers observe that a small number of bacteria survive and continue to reproduce. These surviving bacteria have a mutation that provides resistance to the antibiotic.
Which of the following best explains why these resistant bacteria are able to survive and reproduce?
Background Information:
Antibiotic resistance occurs when bacteria evolve to survive exposure to antibiotics that would normally kill them or inhibit their growth. This phenomenon is a significant public health concern, as it can lead to infections that are harder to treat, increased medical costs, and greater risk of severe illness or death.
In many cases, antibiotic resistance develops through genetic mutations or the acquisition of resistance genes from other bacteria. One common mechanism of resistance involves the production of enzymes that can deactivate antibiotics. For instance, beta-lactamase is an enzyme produced by some bacteria that breaks down beta-lactam antibiotics, which include penicillin and its derivatives. When bacteria produce beta-lactamase, they can resist the effects of penicillin, rendering the antibiotic ineffective.
Factors contributing to the rise of antibiotic-resistant infections in hospital settings include:
Overuse of Antibiotics: Antibiotics are sometimes prescribed unnecessarily, or patients may not complete their prescribed courses, allowing surviving bacteria to adapt and develop resistance.
Patient Population: Hospitals often care for patients with weakened immune systems, making them more susceptible to infections, including those caused by resistant bacteria.
Transmission: Inadequate hygiene and sanitation practices can facilitate the spread of resistant bacteria from one patient to another, especially in crowded or poorly maintained environments.
Invasive Procedures: Procedures such as surgery, catheterization, and ventilator use can introduce bacteria into the body, increasing the risk of infection from resistant strains.
Scenario:
A hospital is experiencing an outbreak of antibiotic-resistant infections caused by a specific strain of bacteria. Researchers find that this strain possesses a gene that enables it to produce an enzyme, beta-lactamase, which breaks down the antibiotic penicillin.
Which of the following factors is most likely contributing to the spread of this antibiotic-resistant strain in the hospital?