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Influenza A Virus Studies in a Mouse Model of Infection
Published on: September 7, 2017
Influenza: epidemiology, etiology, immunization and management
Journal of the American Geriatrics Society
|June 1, 1980
Summary
Annual influenza vaccination is recommended for broad protection against viral strains, with specific vaccines available for high-risk groups. Amantadine offers therapeutic benefits for influenza A infections.
Area of Science:
- Virology
- Immunology
- Epidemiology
Background:
- Influenza is a contagious respiratory illness caused by orthomyxoviruses A, B, and C, presenting varying virulence and epidemiological patterns.
- Influenza A is highly virulent, B is mild, and C is nonvirulent, with swine influenza posing a pandemic risk.
- Past vaccination programs, including one in 1976-77 involving swine virus, have shown varying efficacy and side effect profiles, notably Guillain-Barré syndrome.
Purpose of the Study:
- To review the characteristics of different influenza virus types and their impact on virulence and immunity.
- To discuss the history and outcomes of influenza vaccination programs, including dosages and target populations.
- To evaluate the safety, efficacy, and recommended protocols for influenza vaccination and antiviral treatment.
Main Methods:
- Review of influenza virus classification based on morphology and antigen patterns.
- Analysis of historical influenza vaccination program data, including efficacy and adverse events.
- Examination of recommended vaccination guidelines for specific age groups and individuals with pre-existing conditions.
- Assessment of the therapeutic and prophylactic use of amantadine for influenza A.
Main Results:
- Influenza A, B, and C viruses differ in virulence, with A being most virulent and C nonvirulent.
- The 1976-77 swine flu vaccine was linked to Guillain-Barré syndrome; subsequent vaccines have different safety profiles.
- Vaccine efficacy ranges from 60-85%, with immunity lasting approximately one year, necessitating annual vaccination.
- Recommended vaccine recipients include individuals over 65 and those with chronic health conditions.
- Common side effects include local reactions, fever, and allergic responses; Guillain-Barré syndrome is rare and associated with specific swine virus vaccines.
- Amantadine demonstrates effectiveness in treating and preventing influenza A.
Conclusions:
- Annual vaccination with updated influenza virus vaccines is crucial for maintaining protection due to waning immunity.
- Vaccination is safe and effective for the general population, particularly for high-risk individuals.
- Amantadine serves as a valuable therapeutic and prophylactic agent for influenza A infections.
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