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==How do vaccines work?==

==How do vaccines work?==

Vaccination induces an immunological memory of the infectious organism. High levels of [[T cell differentiation#Cytotoxic T-Cells|cytotoxic T cells]] and neutralising [[Immunoglobulins|antibody]] are activated 24 - 48 hours post vaccination as a [[B cell differentiation#Secondary T Cell Dependent Response|secondary response]] (instead of 4-10 days later as a [[B cell differentiation#T-Cell Dependent Response|primary response]]). Neutralising [[Immunoglobulins|antibody]] then blocks the attachment of the infectious organism to host cell receptors.

Vaccination induces an immunological memory of the infectious organism. High levels of [[T cell differentiation#Cytotoxic T-Cells|cytotoxic T cells]] and neutralising [[Immunoglobulins - Overview|antibody]] are activated 24 - 48 hours post vaccination as a [[B cell differentiation#Secondary T Cell Dependent Response|secondary response]] (instead of 4-10 days later as a [[B cell differentiation#T-Cell Dependent Response|primary response]]). Neutralising [[Immunoglobulins|antibody]] then blocks the attachment of the infectious organism to host cell receptors.

'''Endogenous vaccines''' cause antigens to be made as new proteins by the cell, bacterium or virus and involves [[Major Histocompatability Complexes#MHC I|MHC class I]] processing live virus, recombinant virus or DNA vaccines.

'''Endogenous vaccines''' cause antigens to be made as new proteins by the cell, bacterium or virus and involves [[Major Histocompatability Complexes#MHC I|MHC class I]] processing live virus, recombinant virus or DNA vaccines.