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A Luciferase-fluorescent Reporter Influenza Virus for Live Imaging and Quantification of Viral Infection
Published on: August 14, 2019
Influenza update 2000
1Section on Infectious Diseases, Department of Internal Medicine, Ochsner Clinic and Alton Ochsner Medical Foundation, New Orleans, LA.
Abstract:
Between 30,000-40,000 Americans die annually as a result of influenza epidemics. Spread primarily through the respiratory tract, influenza's classic signs and symptoms are the abrupt onset of fever, myalgia, headache, sore throat, malaise, and nonproductive cough. The elderly and patients with underlying medical illnesses may be at risk for secondary complications. Influenza is caused by an RNA myxovirus that exists in types A, B, and C; however, the A and B types are responsible for most human illness. The Centers for Disease Control and Prevention tracks the viruses' regular pathway through the US each year as they emerge first in Alaska and spread through the lower 48 states, peaking in activity during the winter months. Influenza is preventable by vaccination (efficacy 70%, depending on individual immune status) and is recommended for everyone at increased risk of complications from influenza between 6 months and 50 years of age, and universally for those over the age of 50. The composition of the vaccine has been changed for 2000-2001 to include two new type-A strains and one new type-B. Currently four drugs are available for the treatment of influenza. Early diagnosis can help reduce the inappropriate use of antibiotics and provide the option of using antiviral therapy. Bacterial infections can have similar symptoms or be complications of influenza and should be suspected and treated appropriately if present.
Insights
Influenza epidemics cause 30,000-40,000 American deaths annually. Vaccination and early antiviral treatment are key to preventing complications and reducing mortality from this respiratory illness.
Area of Science:
- Epidemiology
- Virology
- Public Health
Background:
- Influenza epidemics cause significant annual mortality in the US, estimated between 30,000-40,000 deaths.
- The illness is primarily a respiratory tract infection with characteristic symptoms like fever, myalgia, and cough.
- Elderly individuals and those with pre-existing medical conditions are particularly vulnerable to secondary complications.
Purpose of the Study:
- To provide an overview of influenza epidemics, including their cause, transmission, and impact.
- To highlight the importance of vaccination and antiviral therapies in managing influenza.
- To emphasize the need for accurate diagnosis to differentiate influenza from bacterial infections.
Main Methods:
- Review of epidemiological data on influenza spread and mortality.
- Description of influenza virus types (A, B, C) and their clinical significance.
- Information on current influenza prevention (vaccination) and treatment (antiviral drugs).
Main Results:
- Influenza A and B types are responsible for the majority of human illnesses.
- Vaccination efficacy is approximately 70%, with recommendations for high-risk groups and individuals over 50.
- Four antiviral drugs are available for treatment, with early diagnosis crucial for effective therapy.
Conclusions:
- Influenza remains a significant public health concern requiring ongoing surveillance and intervention.
- Vaccination is a primary preventive measure, with updated vaccine compositions annually.
- Prompt diagnosis and appropriate treatment, including antivirals, can mitigate influenza's impact and prevent secondary bacterial infections.
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