Which option is NOT a primary prevention measure for vector-borne disease control?

• A. Eliminating standing water.
• B. Antibiotic prophylaxis for everyone.
• C. Bed nets.
• D. Insect repellent.

Answer: (B)

Primary prevention for vector-borne diseases aims to stop people from getting bitten or infected in the first place. Eliminating standing water reduces mosquito breeding sites and lowers the vector population, making transmission less likely. Bed nets provide a physical barrier that reduces bites while sleeping. Insect repellent lowers contact with vectors, further decreasing bite risk. Antibiotic prophylaxis for everyone does not prevent vector-borne infections, since antibiotics target bacteria and wouldn’t stop viruses or parasites transmitted by vectors; widespread use also raises resistance and safety concerns. So antibiotics used prophylactically for everyone is not a primary prevention measure.