Immune Response in biochemistry
To detect a humoral immune response to influenza virus, it is possible to measure

serum antibody titer
plasma cytokine levels
dividing T cells in the draining lymph nodes
cytotoxicity of virus-infected cells in tissue culture

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Immune Response in biochemistry
Immunological memory is due to

short lived helper T cells that signal macrophage to divide
long lived B cells that secrete a specific antigen
short lived macrophage that can recognize specific pathogens
long lived B cells that secrete a specific antibody

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