Which statement best explains why broad-spectrum antibiotics may be started before culture results are available?

• A. They cover a wide range of possible organisms
• B. They are always the most effective option
• C. They are less toxic than narrow-spectrum antibiotics
• D. They are used only for fungal infections

Answer: (A)

Starting broad-spectrum antibiotics before culture results is about empiric therapy to cover multiple possible bacteria when the exact pathogen isn’t known. In serious infections or sepsis, time matters; waiting for culture results could allow the infection to progress, so clinicians choose an antibiotic likely to work against a wide range of bacteria to reduce treatment delays. This approach increases the chances of hitting the pathogen while results are pending, with the plan to narrow therapy later based on culture data. The other statements aren’t correct because broad-spectrum agents aren’t always the most effective option for every infection, they aren’t inherently less toxic than narrow-spectrum drugs, and they are not used only for fungal infections.