What is the primary purpose of culture and sensitivity testing before selecting an antibiotic in a suspected infection?

• A. To identify the pathogen and determine the most effective antibiotic, enabling targeted therapy and reducing resistance
• B. To start broad-spectrum antibiotics immediately
• C. To assess the animal's immune status
• D. To determine pathogen virulence

Answer: (A)

Culture and sensitivity testing is used to identify the organism causing the infection and to test which antibiotics will effectively inhibit or kill it. By growing the pathogen and assessing its response to different drugs, you can choose the most effective antibiotic for that specific organism, enabling targeted therapy. This approach helps minimize antimicrobial resistance because it avoids unnecessary use of broad-spectrum agents and tailors treatment to the organism’s susceptibility profile. In practice, initial management may start with empiric therapy while results are pending, but the culture and sensitivity results guide the definitive antibiotic choice and dosing once available.