passive immunity


a: Passive immunity ~
b: snow fort


"There are two basic types of disease immunity: passive and active. Passive immunity is resistance that is given to - not developed by - the creature carrying the defense. Such "outside help" provides resistance to a disease in a very short time, but that protection will eventually disappear. In some ways, passive immunity is like a youngster's winter snow fort. The easily erected play castle can provide protection during a short "battle" ... but it will melt away after a few days of sunshine. "

Writer: Randy Kidd
Date: Feb 27 2014 5:04 PM

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