a: herd immunity ~
b: moat around a castle
What:
"The idea of herd immunity is like a moat around a castle or the natural behavior of herd animals when threatened by a predator. The strong surround the weak to protect them from attack; in this case the vaccinated protect those who can't be vaccinated or those with low immunity from contact with the flu by halting the spread of the virus."
Useful?
Writer: Brie Zeltner, The Plain Dealer
LCC:
Where:
Date: Feb 14 2015 10:42 AM
# 7327 Critique Analogy