In an effort to address West Nile virus, a community increased livestock immunization, began a vector control program, and initiated a campaign to eliminate standing water reservoirs. This best exemplifies communicable disease control through:

• A. Health education.
• B. Multisystem approach.
• C. Improved public health infrastructure.
• D. Reduction of environmental hazards.

Answer: (B)

A multisystem approach to communicable disease control targets multiple points in the transmission cycle—host immunity, vectors, and the environment. By immunizing livestock, you reduce the reservoir that can sustain the virus. Vector control directly lowers the mosquito population capable of transmitting the virus. Eliminating standing water removes breeding sites, further reducing vector numbers. Together, these integrated actions disrupt transmission more effectively than focusing on a single strategy.

Health education alone informs and changes behavior but doesn’t by itself implement immunity, vector suppression, or environmental changes. Strengthening public health infrastructure supports programs but isn’t a concrete, multi-pronged intervention by itself. Reducing environmental hazards is important, yet addressing only the environment doesn’t directly diminish the reservoir or the vector population.