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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.
The invading microbe or pathogen is called an antigen. It is regarded as a threat by the immune system and is capable of stimulating an immune response. Antigens are proteins that are found on the surface of the pathogen.Antigens are unique to that pathogen.The whooping cough bacterium, for example, will have different antigens on its surface from the TB bacterium. When an antigen enters the body, the immune system produces antibodies against it. type of white blood cell called a lymphocyte recognizes the antigen as being foreign and produces antibodies that are specific to that antigen. Each antibody has a unique binding site shape which locks onto the specific shape of the antigen.