Neutrophil Mobilization into Peritoneal Fluid

Rats were injected intraperitoneally with various solutions, and the local cellular responses were studied using quantitative methods. Contrary to reports in the literature, pure saline did not evoke a local neutrophilia after it was injected intraperitoneally. Under similar conditions, bacterial lipopolysaccharides proved to be highly effective. Trace doses were most effective; larger doses caused a marked diminution of the response. Furthermore, a variety of nonbacterial substances were impotent when tested under comparable conditions.