This is particularly true within the human body, where iron is concealed in cells and large iron - binding proteins as a first line of defense against infection. (sciencedaily.com)
This is the body's warning sign that something is wrong and acts as a natural defense against infection, so fever is a very natural phenomenon. (newkidscenter.com)
There is some feeling that nasal vaccines may provide a more complete stimulation to the area of the immune system responsible for defense against the infection in question. (marvistavet.com)