Adaptive immunity
When the innate response fails to deal with an invasion, the adaptive immunity takes over. The adaptive cell looks for a specific pattern. It could be a particular protein on the surface of a virus or bacteria.
There are millions of adaptive immune cells, each to recognize a different pattern. When they recognize an invader, they multiply to form an army to kill it. This process can take a week when a new invader infects us. After the invader is removed, the adaptive cells that recognized it are kept as specialized memory cells.
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