Are the current vaccine rates high enough for herd immunity?

• A. Yes
• B. Not sure
• C. Sometimes
• D. No

Answer: (D)

Herd immunity builds when a large enough portion of the population is immune to stop the disease from spreading. The needed level depends on how contagious the disease is—the more contagious, the higher the vaccination rate required. If current vaccine uptake hasn’t reached that threshold, transmission can continue, so herd immunity isn’t achieved. Vaccines aren’t 100% effective, so you also need a safety margin, which often means pushing coverage higher. For these reasons, the statement that current rates are high enough is not correct, so the answer is that herd immunity has not been reached.