TABLE 1.

Effects of chemical inhibitors on the phagocytosis of S. typhimurium by BAC-1.2F5 cells

Pretreatment of cells	Phagocytosis (%) ± SD
None	100
Toxin B
10 ng/ml	56 ± 9.0
100 ng/ml	5 ± 4.0
Wortmannin (100 ng/ml)	3 ± 1.5
Cytochalasin B (10 μM)	2 ± 1.0

Macrophages were infected with Salmonella (MOI of 25). Phagocytosis was assessed as described in Materials and Methods. Untreated macrophages phagocytosed 55% (± 11) of the original inoculum. The phagocytic activity of untreated macrophages was set as 100%.