Our skin, hair provide the first line of defense against infection. If the infection is able to penetrate our bodies, our immune system will be activated to get rid of the infection. The white blood cells in our blood is the primary agent in destroying the infection. The whole process is quite complicated and involves the entire body, so read on here: http://kidshealth.org/parent/general/body_basics/immune.html
I learned in class that your body fight off infection by sending white blood cells out, which send out anti-bodies, trapping any pathogen (infection cells) that come in sight. But other than that, I agree
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