Infection caused by contamination with a particular flu virus, the strain of these viruses change from year to year.
The disease is present during the cold season. The first sign is the fever of over 39 degrees Celsius, accompanied by chills.
Other symptoms: headaches, particularly to the eyes, fatigue, muscle aches throughout the entire body, lack of appetite and coughing.
In some forms there appear nausea, vomiting and runny nose.
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