ABSTRACT
Adjustment Minimising, by statistical methods, the effects of differences in composition of the populations being compared.
Aetiology The cause of a disease. Agglutination Clumping together of antigens by antibodies so that a
visible agglutinate is formed. Antibody Protein formed in direct response to the introduction into an
individual of an antigen, which combines with its specific antigen, e.g. to neutralise toxins or destroy bacteria.
