Staph infections, caused by the bacterium Staphylococcus aureus, are increasing in frequency and are more difficult to treat with antibiotics. Many staph infections are now caused by MRSA, and methicillin-resistant strain of S. aureus. What explains the more widespread phenomenon of MRSA prevalence in staph infections?
A. Vaccines became less effective because of the changes in the human immune system
B. Antibiotics caused mutations in the bacteria
C. hospitals decreased their sanitation practices
D. Resistant bacteria already existed from random mutations and the excessive use of antibiotics increased the frequency of the resistant strain
Select your answer:
Topics:
Cells, Tissues and Organs Cell Theory and Cellular Structure Enzymes and Movement of Substances Muscularskeletal System Haematology Environment Nervous / Sensory System Reproduction Factors Affecting Health Molecular Biology What is Psychology? 3M Micropara Benefits of Physical Activity Types of Immunity Blood GroupsOther quiz:
DNA Structure and Function › ViewWhat is the first step in replication of DNA?
A. unzip the double helix structure
B. unwind the double helix structure
C. rewind the double helix structure
D. duplicate the double helix structure
Body Systems › View
The _______ is a muscle beneath your lungs that helps move air into and out of your body.
A. Diaphragm
B. Lungs
C. Trachea
D. Pharynx