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Flu
What is Flu ?
Influenza, usually known as the flu, is a respiratory-tract infection caused by one of the influenza viruses that typically is spread by air or by direct contact.
Causes of Flu
Most of the time, doctors assume the diagnosis is influenza when you have an illness in the winter with the symptoms of influenza. If your symptoms or findings on physical examination suggest something other then the flu, your doctor may order blood tests and swab your nose and throat to send secretions to the laboratory for specific influenza testing.
Symptoms of Flu
Symptoms can include any or all of the following:
- Chill
- Moderate to high fever (101 to 103 degrees Fahrenheit)
- Sore Throat
- Runny nose
- Muscle aches
- Diarrhea
- Dizziness
- Headaches
- Fatigue
- Cough
Dangerous complications also can develop from influenza. One of the most feared complications, a bacterial "superinfection," occurs when the influenza virus attacks the lung and weakens its defenses, allowing bacteria that normally live quietly in the nose and throat to descend into the lung and cause bacterial pneumonia. People over 50, infants, and those with certain chronic diseases or suppressed immune systems are especially vulnerable to complications.
Diagnosis
Your doctor will evaluate your symptoms to determine whether you have influenza or a cold. If you are sneezing and have a stuffy nose, you may have a cold. Influenza is more likely to cause fever, coughing, chills and muscle aches. It also is more seasonal than colds. Flu tends to occur during winter months, whereas colds occur all year long.
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