What is influenza? What are the symptoms?


What is Influenza? Symptoms, Causes, Treatment, and Prevention


Influenza, commonly known as the flu, is a viral infection that affects the respiratory system. It is highly contagious and can spread from one person to another through droplets released when an infected person coughs, sneezes or talks. Influenza can cause mild to severe illness, and in some cases, it can be life-threatening. In this article, we will discuss the symptoms, causes, diagnosis, treatment, and prevention of influenza.

What is Influenza?

Influenza is a contagious viral infection that affects the nose, throat, and lungs. It is caused by the influenza virus, which has several subtypes, including A, B, and C. Influenza A and B are responsible for most cases of flu in humans. Influenza C usually causes mild respiratory illness and is not as severe as the other types.

Symptoms of Influenza

The symptoms of influenza can vary depending on the severity of the infection. Common symptoms include:

  • Fever
  • Cough
  • Sore throat
  • Runny or stuffy nose
  • Body aches
  • Headache
  • Chills
  • Fatigue

In some cases, people may experience vomiting and diarrhea, although these symptoms are more common in children than adults.

How Is Influenza Diagnosed?

Influenza is usually diagnosed based on the symptoms and physical examination. However, to confirm the diagnosis, a doctor may order a test that detects the presence of the influenza virus in respiratory secretions.

Causes of Influenza

Influenza is caused by the influenza virus, which is highly contagious and can spread rapidly from one person to another. The virus is primarily transmitted through respiratory droplets when an infected person talks, coughs or sneezes. It can also be transmitted by touching a surface contaminated with the virus and then touching one’s mouth, nose or eyes.

How Is Influenza Treated?

The treatment for influenza depends on the severity of the infection. Mild cases of influenza can be managed with rest, plenty of fluids, and over-the-counter medications for fever and body aches. Antiviral medications may also be prescribed to reduce the duration and severity of the illness. However, these medications work best when taken within the first 48 hours of symptoms appearing.

How is the Influenza Virus Transmitted?

The influenza virus is transmitted through respiratory droplets that are released when an infected person talks, coughs, or sneezes. The virus can also survive on surfaces for several hours, and people can become infected by touching a contaminated surface and then touching their mouth, nose, or eyes.

Is Influenza Contagious?

Yes, influenza is highly contagious, and people can become infected by being in close contact with an infected person. The virus can spread rapidly in crowded areas such as schools, offices, and public transport.

Can Influenza Patients Travel?

People who have influenza should avoid traveling until they have recovered fully. This is to prevent the spread of the virus to others, particularly those who may be more susceptible to severe illness, such as young children, the elderly, and people with weakened immune systems.

Is Influenza Preventable With Vaccine?

Yes, the influenza vaccine is the most effective way to prevent the flu. The vaccine is typically available in the fall, and it is recommended that everyone over six months of age receives it annually. The vaccine can reduce the risk of getting the flu, and if a person still gets infected, it can reduce the severity of the illness.

What’s the Difference Between Influenza and Colds?

Influenza and the common cold are both respiratory illnesses, but they are caused by different viruses. Influenza tends to be more severe than a cold and can cause more complications. The symptoms of influenza usually come on suddenly and are more severe than those of a cold. Colds, on the other hand, tend to develop gradually and are less severe than influenza.

Does the Influenza Virus Vary According to the Seasons?

Yes, the influenza virus varies according to the seasons. In temperate climates, influenza usually occurs in the winter months, while in tropical climates, it can occur throughout the year. The virus can also mutate, making it more difficult to develop effective vaccines against it.

How to Protect from Influenza?

The best way to protect oneself from influenza is to get vaccinated annually. Other measures that can help prevent the spread of the virus include:

  • Washing hands frequently with soap and water or using an alcohol-based hand sanitizer.
  • Covering the nose and mouth when coughing or sneezing.
  • Avoiding close contact with people who are sick.
  • Staying home when feeling unwell to prevent the spread of the virus.


Influenza is a highly contagious viral infection that can cause mild to severe illness. It is important to take preventive measures such as vaccination, hand hygiene, and staying home when unwell to prevent the spread of the virus. If one does contract influenza, seeking medical attention promptly and following the prescribed treatment plan can help manage the illness and prevent complications.


  1. Can influenza be treated with antibiotics? No, antibiotics are not effective against viruses such as influenza.
  2. How long does it take to recover from influenza? Recovery from influenza can take anywhere from a few days to several weeks, depending on the severity of the illness.
  3. Who is at risk of complications from influenza? Children, the elderly, pregnant women, and people with underlying health conditions are at a higher risk of complications from influenza.
  4. Can one get influenza twice in one season? Yes, it is possible to get influenza more than once in a season, as the virus can mutate.
  5. Is it safe to get vaccinated for influenza during pregnancy? Yes, getting vaccinated for influenza during pregnancy is safe and recommended to protect both the mother and baby.
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