What is the main purpose of mass vaccination programs in public health?

• A. Build herd immunity to reduce spread, contraction and impact of infectious disease
• B. Provide individualized treatment for each infection
• C. Replace hygiene measures entirely
• D. Increase hospital funding without affecting disease spread

Answer: (A)

Mass vaccination programs aim to create herd immunity, which happens when a large portion of the population becomes immune and the disease can’t spread easily. This dramatically reduces new infections, lowers the overall burden of disease, and protects people who can’t be vaccinated or who don’t respond well to vaccines. It’s about preventing spread at the population level, not about giving individualized treatment for each infection. Vaccination works alongside good hygiene and other public health measures, rather than replacing them, and it’s not a tool to directly increase hospital funding. By cutting transmission and severe illness, mass vaccination helps keep communities healthier and less overwhelmed by outbreaks.