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Individuals Staphylococcus Bacteria Time Resistance Describe Human Activity

Human activity, like antibiotic use, drives evolution in Staphylococcus aureus; resistance mutations allow survival and reproduction, increasing the frequency of resistant alleles and leading to MRSA.

Human activity, like antibiotic use, drives evolution in Staphylococcus aureus; resistance mutations allow survival and reproduction, increasing the frequency of resistant alleles and leading to MRSA.

Front Describe how human activity has resulted in evolution in populations of Staphylococcus aureus.
Back Methycillin-resistant Staphylococcus aureus:
  • Bacteria reproduce rapidly and evolve in short time
  • A mutation arose in S. aureus that allowed resistance to methicillin
  • When bacteria exposed to antibiotic, resistant individuals survived and reproduced, passing the allele for resistance onto offspring
  • Non-resistant individuals died
  • Over time number of resistand individuals increased - estanblishing MRSA as species

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