A complex network of cells, cell products, and tissues that work together in order to protect the body from infection. The immune system prevents and limits the entry of various microbes such as viruses, bacteria, fungi, and parasites into the human body.

Reference:

“immune system.”¬†Dictionary.com Unabridged. Random House, Inc. 02 Dec. 2014. <Dictionary.com¬†http://dictionary.reference.com/browse/immune system>.

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