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Updated: Aug 10, 2026
Direct Observation of Phagocytosis and NET-formation by Neutrophils in Infected Lungs using 2-photon Microscopy
Published on: June 2, 2011
[Phagocytic-activity in high risk patients of a surgical intensive care unit (author's transl)]
Abstract:
The in vitro phagocytic activity from PMNL against eight different Klebsiella strains, isolated from clinical material, was investigated and the K-index calculated for fifteen patients from a surgical intensive care unit. The hemagglutinating antibody titers against the test strains, as well as the serum concentrations of IgM, IgG, C3 and C4 were also determined. At the time of the investigation all patients had symptoms of a severe general infection. There could be no decrease in the phagocytic activity demonstrated. However, large variations against certain bacterial strains were observed. This same strain dependency was also observed for five healthy persons. The hemagglutinating antibody titers of any one patient were either generally increased for all strains or uniformly decreased. The serum concentrations of IgM, IgG, C3 and C4 were found to be, in general, within the normal large.
Insights
Phagocytic activity of polymorphonuclear leukocytes (PMNL) in severe infections showed strain-dependent variations against Klebsiella, not a general decrease. Antibody titers and complement levels remained largely normal in patients.
Area of Science:
- Immunology
- Microbiology
- Clinical Medicine
Context:
- Investigated phagocytic activity of polymorphonuclear leukocytes (PMNL) in patients with severe general infections.
- Examined Klebsiella strains isolated from clinical material.
- Assessed fifteen patients from a surgical intensive care unit.
Purpose:
- To evaluate the in vitro phagocytic activity of PMNL against various Klebsiella strains in critically ill patients.
- To determine hemagglutinating antibody titers and serum complement levels (IgM, IgG, C3, C4).
- To correlate these immune parameters with the severity of infection.
Summary:
- Phagocytic activity of PMNL against eight Klebsiella strains showed significant strain-dependent variations, rather than a generalized decrease, in patients with severe infections.
- These variations were also observed in healthy individuals, suggesting inherent bacterial strain characteristics influence phagocytosis.
- Hemagglutinating antibody titers were uniformly increased or decreased across strains for individual patients.
- Serum concentrations of IgM, IgG, C3, and C4 were generally within normal ranges, despite severe infection.
Impact:
- Highlights the complexity of immune response in severe infections, emphasizing strain-specific bacterial interactions.
- Suggests that phagocytic capacity is not uniformly impaired in severe infections but is modulated by bacterial factors.
- Provides baseline immune data for critically ill patients, aiding in understanding infection pathogenesis and potential therapeutic targets.
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