data are presented that support the conclusion that serum iga functions as a regulatory ig that modulates activation of complement by bacteria entering the circulation in showers of low inoculum from mucosal sites of colonization , and that preserves the antigenic mass by shunting such low inocula into macrophages and away from polymorphonuclear leukocytes , thus permitting immunologic processing .
C0009528
activation
C0003320
antigenic