Which of the following are three drivers of antimicrobial resistance?

• A. Vaccination rates; Hand hygiene; Quarantine
• B. Antibiotic usage; Horizontal transmission of resistance genes among bacteria; Acquisition of resistant bacteria via contamination of food, water, environment
• C. Antibiotic usage; Horizontal transmission of resistance genes among bacteria; Genetic mutations in bacteria
• D. Antibiotic usage; Horizontal transfer; Overuse of disinfectants

Answer: (B)

Antimicrobial resistance grows when bacteria acquire and spread resistance traits, and the strongest three drivers are:

• Antibiotic usage: Using antibiotics creates selective pressure that favors resistant bacteria, allowing them to survive and multiply while susceptible ones are killed or inhibited.

• Horizontal transmission of resistance genes among bacteria: Resistance genes can move between bacteria through plasmids, transposons, and other mobile elements, spreading resistance across species and strains quickly.

• Acquisition of resistant bacteria via contamination of food, water, and the environment: Exposure to resistant organisms from contaminated sources introduces resistant strains into new hosts and environments, increasing prevalence and opportunities for further spread.

The other options don’t capture these primary pathways as clearly. Vaccination, hand hygiene, and quarantine help prevent infections and can reduce antibiotic use, but they aren’t direct drivers of resistance. Disinfectant overuse is not a major driver of antibiotic resistance in pathogens in the same way as antibiotic use and gene transfer are.