Prolonged use of quinolones may cause ________ , which is the appearance of a new infection with a different strain or species of microorganism during antibiotic treatment.

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Prolonged antibiotic therapy can wipe out susceptible bacteria in the normal flora, reducing competition and letting other microorganisms establish an infection. This situation is known as a superinfection. Quinolones, being broad-spectrum, disrupt the balance of microbes and can allow a different strain or species to cause disease during treatment. This differs from resistance, where bacteria survive the drug due to adaptive traits but aren’t necessarily a new infection by a different organism; it also isn’t hyperinfection, which refers to an excessive parasite burden, nor colonization, which is the presence of organisms without causing illness. Therefore, the described scenario best fits superinfection.