Influenza typically has an acute onset with severe symptoms.The following symptoms or complaints may occur with seasonal influenza:
- Sudden onset
- Fever over 39 °C (with chills)
- Cough (irritable cough) with tachypnea (respiratory rate > 20/min).
- Headache and pain in the limbs
- Sore throat
- Pharyngitis (inflammation of the throat)
- Tracheobronchitis (inflammation of the mucous membranes of the trachea and large bronchi), accompanied by dry cough, viscous sputum, sore throat and hoarseness.
- Chills
- Myalgia (muscle pain) and cephalgia (headache).
- Fatigue, tiredness
- Hoarseness
- Eye burning and sensitivity to light (photophobia).
- Relative bradycardia (slowing of the pulse).
- Circulatory weakness with dizziness and orthostatic hypotension (sudden drop in blood pressure after changes in position).
- Anorexia (loss of appetite)
- Strong feeling of illness
Other indications
- Influenza is characterized by a sudden onset of illness and symptoms are usually most severe between days 3 and 7.
- In the elderly, patients with chronic lung disease or immunosuppressed individuals, pneumonia may manifest atypically, that is, for example, without fever.
- A second rise in fever is indicative of a bacterial superinfection (secondary infection with bacteria).
- If no complications occur, the prognosis is good and the duration of the course of the disease is about a week.However, the subsequent convalescence can last up to 4 weeks.
The following symptoms or symptoms may occur in the new influenza (swine influenza / swine flu):
- Symptoms of seasonal influenza (see above).
- Diarrhea (diarrhea) – in about 41% of cases.
- Nausea (vomiting), nausea.
Clinical symptoms/discomforts begin immediately and resolve spontaneously in 3-5-7 days in most cases.
The following symptoms or complaints may occur in avian influenza (bird flu):
