iNOS staining in brain and chest wall from culture-defined cases of septis. Pattern shown was the same in all cases illustrated. A: Frontal lobe of brain from Streptococcus pneumoniae infection, showing negligible vascular wall iNOS. B: Meninges from pons region from Salmonella enteriditis infection, with strong iNOS staining. C: Chest wall vessel and muscle from E coli infection showing strong staining for iNOS. D: Chest wall vessel and muscle from Haemophilus influenzae infection showing strong staining for iNOS. Scale bar, 100 μm.