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In the context of antibiotic resistance, "fitness" refers to the ability of bacteria to survive and reproduce in the presence of antibiotics compared to non-resistant strains. Resistant bacteria may have mutations or genetic traits that confer survival advantages, allowing them to thrive even when exposed to antibiotics. However, these traits can sometimes come with fitness costs, such as slower growth rates or reduced competitiveness in the absence of antibiotics. Ultimately, the balance between resistance and fitness influences the prevalence and spread of antibiotic-resistant strains in bacterial populations.

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1d ago

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The doctor prescribed antibiotics to cure her case of strep throat.


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This term is misleading. The antibiotic "selects" bacteria that are not affected by it. If a person will grow bacteria on a petri dish and add an antibiotic to it, some bacteria may live and grow. This is actually a form of natural selection. The ones that will grow are resistance to the antibiotic. They have some way of not being affected. If a person takes a colony from the plate that has this resistance and grows it on another plate and add the antibiotic, all on the plate will be resistant.


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Achieving life-long fitness is a long-term fitness goal.


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