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Roderick A. Barke, MD; David L. Dunn, MD, PhD; Agustin P. Dalmasso, MD; Melody O'Connor-Allen, MD; Richard L. Simmons, MD; Edward W. Humphrey, MD, PhD

Arch Surg. 1989;124(4):449-452.

Abstract
• Bacterial virulence indicates the degree of pathogenicity of a given strain of microbe for a given host. The effect of Escherichia coli virulence on lung microvascular permeability was studied in sheep with chronic pulmonary lymph fistulas following peritoneal contamination. The study was divided into four groups: (1) wild-type E coli (WT group, 2.5x 10⁹ colony-forming units [CFUs]/kg); (2) virulent E coli (PV group, 2.3x10⁹CFUs/kg); (3) nonvirulent E coli (PNV group, 2.6x 10⁹ CFUs/kg); (4) high-inoculum wild-type E coli (HIWT group, 6.1 x 10⁹ CFUs/kg). In the late period (two to six hours), the increase in lung lymph flow in the PV group was significantly greater than the WT, PNV, and HIWT groups, with no difference noted among groups with respect to the pulmonary artery pressure, pulmonary wedge pressure, or albumin lymph/plasma ratio. It was concluded that (1) increased E coli virulence results in increased lung microvascular damage and (2) increased lung microvascular damage as a function of E coli virulence may not be solely due to increased bacterial numbers as a function of time.

(Arch Surg 1989;124:449-452)

Author Affiliations
From the Departments of Surgery (Drs Barke, Dunn, O'Connor-Allen, Simmons, and Humphrey), Pathology (Dr Dalmasso), and Laboratory Medicine (Dr Dalmasso), The University of Minnesota, Minneapolis, and the Veterans Administration Medical Center, Minneapolis (Drs Barke, Dalmasso, O'Connor-Allen, and Humphrey).

Footnotes
Accepted for publication Nov 14, 1988.

Read before the 12th Annual Surgical Symposium of the Association of Veterans Administration Surgeons, Minneapolis, May 12, 1988.

Reprint requests to Department of Surgery (112), Minneapolis Veterans Administration Medical Center, Minneapolis, MN 55417 (Dr Barke).

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