Influenza and its features in children
Influenza is an acute respiratory viral disease that occurs with symptoms of intoxication, viral damage of the respiratory tract, as well as for the development of various complications due to the attachment of bacterial infection.
Wherein disease flu can develop into epidemic outbreaks, pandemics. This acute respiratory infection can cause death.
The flu is caused by an RNA-containing representative of myxoviruses. In total, there are three types of such viruses: A, B and C. These relatives are similar in many respects to each other, but they differ significantly in antigenic composition.
Most of all, the influenza A virus is capable of changing its structure. Its antigenic composition is almost always in a state of volatility. The virus is mainly changed by surface antigens, and this is haemagglutinin (H) and neuraminidase (N). Their mutations arise independently of each other. Hemagglutinin is more prone to such changes. If both antigens mutate, a new type of virus appears, which is quite capable of causing a pandemic.
Viruses B and C types also change, but their changes do not pose a significant threat.
On the contrary, the fact of finding the influenza A virus in the body of birds and pigs is important, which at one time led to a mutation and the ability to infect humans. As the virus A changes, epidemics occur (in 2-3 years) and pandemics (in 10-15 years). Influenza B is manifested in epidemics at intervals of 5-6 years, and virus C often affects people in small closed groups and institutions.