Prolonged antibiotic therapy encourages which of the following?

• A. Dysbiosis and resistance
• B. Faster healing
• C. Improved immune response
• D. Perfect microbial balance

Answer: (A)

Prolonged antibiotic therapy creates a selective environment that favors resistant bacteria while wiping out susceptible members of the normal flora. This disruption of the microbiome—dysbiosis—reduces the body's natural colonization resistance, making it easier for pathogens to take hold and for resistant strains to expand. The longer the exposure, the greater the chance that resistance genes spread among bacteria, through mechanisms like plasmids and gene transfer, which fuels broader antimicrobial resistance.

Because of this, healing is not accelerated by long courses; instead, it can be hindered by collateral damage to beneficial microbes and by infections caused by resistant organisms or opportunists such as C. difficile. The idea of a perfectly balanced microbiome is unrealistic once antibiotics have disrupted it, and antibiotics do not directly boost immune function. So the statement that prolonged therapy encourages dysbiosis and resistance best captures the actual consequences.