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1 Lymphocytes, neutrophils, and monocytes. 2  These white blood cells fight against invading bacteria, viruses, or fungi to help destroy infection. 3  Each of these cells differs in appearance. 4  Eosinophils and basophils.5  These white blood cells respond to allergens that can invade our bodies. Lymphocytes, neutrophils, and monocytes. 2  These white blood cells fight against invading bacteria, viruses, or fungi to help destroy infection. 3  Each of these cells differs in appearance. 4  Eosinophils and basophils.
They are part of. the immune system.One kind of immune cell ag-. gressively attacks and kills any cell identified as for-. eign, whereas the other type marks the foreign cell or. virus for elimination by the roaming patrols. The Skin as a Barrier to Infection. The skin is the largest organ of the vertebrate body, ac-.