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Influenza is an acute respiratory tract infectious disease caused by influenza virus, which is highly infectious and spreads quickly.
The main routes of transmission are through airborne droplets, person-to-person contact, or contact with contaminated objects. The epidemic peaks of influenza are winter-spring season.  Influenza is self-limiting, young adults with normal immunity generally heal themselves. Infants, the elderly and patients with heart and lung disease are prone to pneumonia and other serious complications leading to death.

Human influenza viruses are mainly influenza a and b.

* The incubation period of influenza is usually 1-3 days. Clinical symptoms includes high fever, fear of cold, headache, muscle pain, runny nose,sore throat,cough,etc.

* Mild influenza usually has only low fever or mild respiratory symptoms. It will heal itself in 2-3 days.
* The onset of pneumonic influenza is similar to that of typical influenza, but the disease worsens after 1-3 days which could cause high fever, chest pain, coughing and, in severe cases, respiratory failure can lead to death. This kind of flu is more common in infants, the elderly, people with chronic diseases and low immunity. In addition, pregnant and perinatal women and obese people are also at high risk of severe influenza.

Influenza - related laboratory testing methods include nucleic acid testing, virus isolation and culture, antigen testing, serological testing and other methods. Influenza treatment includes general treatment, antiviral treatment and other methods.

* Clinically diagnosed and diagnosed patients should be isolated as soon as possible. Patients with mild illness can be isolated at home and avoid contact with others and keep indoor ventilated, drink more water, strengthen nutrition, keep mouth, pharynx, nose sanitation,treating the symptoms with medications.

* Antiviral drugs work best when administered within 48 hours of illness. Early use of drugs, can reduce complications, reduce mortality, shorten the course of disease.
* Antiviral therapy remains effective in critically ill patients who have been ill for more than 48 hours.
* Oseltamivir, peramivir and other drugs are effective in the treatment of influenza a and b and should be used reasonably under the guidance of a doctor.

Prevention of the flu:

Influenza vaccination is the most effective way to prevent influenza and can significantly reduce the risk of influenza and serious and occurring in vaccinated persons. The flu vaccine should be administered before the annual flu pandemic to produce effective protective antibodies. And the annual flu vaccine varies depending on the type of virus circulating, so an annual dose is recommended.