Related Experiment Videos
Impaired polymorphonuclear leucocyte chemotaxis after influenza virus infection
Abstract:
Polymorphonuclear leucocyte function was assessed in 13 patients with influenza by measuring phagocytosis of staphylococci and chemotaxis. Significant impairment of chemotaxis was shown. Subsequeuntly polymorph chemotaxis was found to be impaired in a group of volunteers infected with virus recombinants of A/New Jersey/8/76 but not in volunteers infected with a virus recombinant of A/Victoria/3/75. These results accord well with the in vitro effects of certain influenza viruses on polymorph function and suggest that interference with polymorph function may predispose to bacterial pneumonia after clinical influenza.
Insights
Influenza virus infection impairs polymorphonuclear leucocyte function, specifically chemotaxis. This dysfunction may increase the risk of secondary bacterial pneumonia following influenza.
Area of Science:
- Immunology
- Virology
- Infectious Diseases
Background:
- Influenza virus infections are common globally.
- Polymorphonuclear leucocytes (PMNs) are critical for immune defense against bacterial infections.
- Impaired PMN function can lead to secondary bacterial complications.
Purpose of the Study:
- To investigate the impact of influenza virus infection on polymorphonuclear leucocyte function.
- To determine if specific influenza virus strains differentially affect PMN function.
- To explore the potential link between altered PMN function and post-influenza bacterial pneumonia.
Main Methods:
- Assessed PMN phagocytosis of staphylococci and chemotaxis in 13 influenza patients.
- Evaluated PMN chemotaxis in volunteers infected with specific influenza A virus recombinants (A/New Jersey/8/76 and A/Victoria/3/75).
Main Results:
- Significant impairment of PMN chemotaxis was observed in patients with influenza.
- PMN chemotaxis was impaired in volunteers infected with A/New Jersey/8/76 virus recombinant.
- PMN chemotaxis was not impaired in volunteers infected with A/Victoria/3/75 virus recombinant.
- In vitro studies showed similar effects of certain influenza viruses on PMN function.
Conclusions:
- Influenza virus infection, particularly certain strains, can significantly impair polymorphonuclear leucocyte chemotaxis.
- This functional deficit in PMNs may contribute to an increased susceptibility to bacterial pneumonia after clinical influenza.
- Further research into strain-specific viral effects on immune cell function is warranted.