phagocytosis of bacteroides nodosus by ovine peripheral blood leucocytes ( pbl ) was examined after organisms had been opsonized in sera from normal sheep , or from animals immune to , or infected with ovine footrot . ingestion of bacteria , as assessed microscopically or by counting isotopically-labelled organisms spectrometrically was effected in suspensions by polymorphonuclear leucocytes ( pmn ) .
C0029235
organisms
C0004611
bacteria