Influenza is an acute respiratory infection caused by influenza virus, and it is also a disease that is highly contagious and spreads rapidly. It is mainly transmitted by droplets in the air, contact between people or contact with contaminated objects. Typical clinical symptoms are: high fever, generalized pain, significant weakness, and mild respiratory symptoms. The general autumn and winter season is its high incidence, and the complications and deaths caused by it are very serious. The disease is caused by influenza virus and can be divided into three types: A, B, and C. The Influenza A virus often undergoes antigenic variation, is highly contagious, spreads rapidly, and is prone to widespread epidemics.
The influenza virus is not heat-resistant, inactivated at 100 ° C for 1 minute or 56 ° C for 30 minutes. The virus is sensitive to commonly used disinfectants (1% formaldehyde, peracetic acid, chlorine-containing disinfectants, etc.) and is sensitive to ultraviolet light. It is resistant to low temperature and dryness, and it can survive after vacuum drying or below -20 °C. Among them, influenza A virus often undergoes antigenic variation, is highly contagious, spreads rapidly, and is prone to widespread epidemics.