A man was scratched by an old tool and developed a virulent staphylococcus infection. In the course of the man's immune response, circulating lymphocytes containing the antigenic message returned to the nearest lymph node
During what stage of the immune response did this occur?
A) Recognition stage
B) Proliferation stage
C) Response stage
D) Effector stage
Ans: B
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The recognition stage of antigens as foreign by the immune system is the initiating event in any immune response. The body must first recognize invaders as foreign before it can react to them. In the proliferation stage, the circulating lymphocyte containing the antigenic message returns to the nearest lymph node. Once in the node, the sensitized lymphocyte stimulates some of the resident dormant T and B lymphocytes to enlarge, divide, and proliferate. In the response stage, the differentiated lymphocytes function either in a humoral or a cellular capacity. In the effector stage, either the antibody of the humoral response or the cytotoxic (killer) T cell of the cellular response reaches and connects with the antigen on the surface of the foreign invader.
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