The search for preparations of human gammaglobulin that could be admin
istered safely intravenously was driven by the need to better manage i
mmune deficiency stares. However, when suitable formulations were deve
loped, it was soon realised that large infusions of immunoglobulin cou
ld be used to manipulate the immune system. The production of autoanti
bodies was minimised or their effects neutralised; T cell effector and
regulatory function could be manipulated and cytokine release modifie
d. More than fifty human disease states, many until now lacking safe a
nd effective therapies, can be improved by the administration of intra
venous immunoglobulin. Better understanding of the mechanisms involved
will not only improve therapy but will provide a better understanding
of the immunopathogenic mechanisms reponsible.