Eagle Effect

A phenomenon in which an antibiotic fails to completely kill bacteria in solution—the proportion of surviving cells increase significantly as the concentration of the antibiotic increases
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Antibiotics as well, which have been in greater circulation in recent years, have been known to produce the "Eagle effect" - a phenomenon named after Harry Eagle, the physician who first noticed that when bacteria are exposed to antibiotics for a long enough time, their population rates not only stabilize; they increase.