Agglutination Reactions Involve particulate antigens and antibodies △0 Antigenic determinants 。Antigens may be: 。On a cell(direct agglutination) △ Bacterium 。Attached to latex △△0 spheres (indirect 0口V or passive agglutination) Figure 18.4Agglutination Reactions • Involve particulate antigens and antibodies • Antigens may be: • On a cell (direct agglutination) • Attached to latex spheres (indirect or passive agglutination) Figure 18.4