Fig. 6.

Assessment of macrophage apoptosis (by acridine orange ethidium bromide co-staining) following infection with Salmonella typhi after 6 h of incubation after blocking tumour necrosis factor (TNF)-α activity. Values are expressed as mean ± standard deviation of six different observations. *Significant difference (P < 0·01) from untreated control and normal S. typhi-infected macrophages. †Significant difference from anaerobic S. typhi-infected macrophages without anti-TNF-α antibody treatment.