What factor best reduces the spread of infectious diseases?

• A. Preventing transmission between people
• B. Taking medication only
• C. Wearing clean clothing daily
• D. Dental hygiene three times a day

Answer: (A)

The main idea here is interrupting how diseases move from one person to another. Infectious diseases spread when pathogens pass through direct contact, droplets, surfaces, or other transmission routes. The most effective way to reduce that spread is to prevent transmission between people—to break those pathways. Actions like staying home when sick, covering coughs or sneezes, washing hands regularly, using masks when appropriate, and getting vaccinated all help keep pathogens from moving to others.

Taking medicine helps the person who is sick recover, and in some cases may lessen contagiousness, but it isn’t a reliable, broad strategy to prevent transmission to others by itself. Wearing clean clothing daily and dental hygiene are important for health in general, but they don’t directly address the primary ways pathogens spread through a community.