The Flu (Influenza): Understanding, Preventing and Treating

I am a family physician and medical director of French origin, having completed my schooling and practiced in France before settling in Quebec. My goal is to help you better understand health issues. Today, we are going to address a seasonal topic: the flu, also known as influenza.

What is the flu (influenza)?

The flu, or influenza, is a contagious viral infection that primarily affects the upper respiratory tract, including the nose, throat and sometimes the lungs. It is caused by influenza viruses, mainly types A and B. Flu symptoms can vary but often include:

• Sudden fever

• Dry cough

• Sore throat

• Muscle and joint pain

• Intense fatigue

• Headaches

How is the flu (influenza) transmitted?

The influenza virus is primarily transmitted through respiratory droplets released when an infected person coughs, sneezes or speaks. It can also spread by touching surfaces contaminated with the virus and then touching one's face.

Diagnosis of the flu (influenza)

The diagnosis of the flu is generally based on clinical symptoms. However, to confirm the diagnosis, specific tests may be used, such as:

1. Rapid antigen detection tests: These tests can provide results in 10 to 15 minutes and are often used in clinics and hospitals.

2. Molecular tests (PCR): These tests are more accurate and can identify specific strains of the influenza virus. They generally require sending a sample to a laboratory, and results can take from a few hours to a few days.

3. Viral culture: Although less commonly used due to the time required to obtain results, viral culture can be useful for monitoring flu strains.

Diagnostic tests are generally reserved for at-risk individuals, those presenting severe symptoms, or for epidemiological reasons to monitor and control the spread of the virus.

Prevention of the flu (influenza)

Prevention is essential to reduce the spread of the flu. Here are some effective measures:

1. Vaccination: The flu vaccine is the most effective way to prevent the flu. It is recommended to get vaccinated every year, as influenza viruses constantly evolve.

2. Hand hygiene: Wash your hands frequently with soap and water for at least 20 seconds.

3. Respiratory etiquette: Use a tissue or your elbow to cover your mouth and nose when coughing or sneezing.

4. Avoid close contact: Avoid close contact with sick people and stay home if you are ill.

Treatment of the flu (influenza)

If you contract the flu, several measures can help relieve symptoms and speed up recovery:

1. Rest: Get plenty of rest to help your body fight the infection.

2. Hydration: Drink plenty of fluids to avoid dehydration.

3. Medication: Antiviral medications may be prescribed to reduce the severity and duration of symptoms, especially if taken within the first 48 hours after the onset of symptoms. Analgesics and antipyretics, such as acetaminophen or ibuprofen, can help relieve fever and pain.

Criteria for taking antivirals

Antivirals, such as oseltamivir (Tamiflu) and zanamivir (Relenza), can help reduce the duration and severity of flu symptoms. They are particularly useful in preventing serious complications in certain at-risk populations. Here are the criteria for taking antivirals:

1. People at high risk of complications: Antivirals are recommended for individuals with a high risk of flu-related complications, including:

• Children under 5 years old, particularly those under 2.

• Adults aged 65 and older.

• Pregnant women and those who have given birth within the last two weeks.

• People with chronic diseases (asthma, diabetes, heart disease, etc.).

• Immunocompromised individuals (HIV, immunosuppressive treatments, etc.).

2. Severe symptoms or complications: Antivirals may be prescribed to people presenting severe flu symptoms, such as pneumonia, or those requiring hospitalization.

3. Early start of treatment: Antivirals are most effective when administered within 48 hours after the onset of symptoms. However, they can still be beneficial for high-risk individuals even if treatment begins after this window.

4. Exposure to the flu: Antivirals may be used prophylactically to prevent the flu in high-risk individuals who have been exposed to the virus.

Precautions and side effects

Antivirals can cause certain side effects, such as nausea, vomiting, headaches and respiratory issues (in the case of zanamivir). It is important to discuss the potential benefits and risks with your doctor before starting antiviral treatment.

Conclusion

The flu (influenza) is a common but potentially serious illness. By understanding the modes of transmission and prevention measures, as well as knowing how to treat symptoms, you can better protect your health and that of those around you. If you think you are at risk or if you have severe symptoms, consult your doctor quickly to determine if antiviral treatment is appropriate for you.

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