All of us periodically are ill with flu. Also can be connected with prevalence of the flu but we do not realize all danger of this disease. Certainly adult person with good immunity is not exposed to serious risk. Into risk group enter: small children, pregnant women and older persons. The most dangerous about flu is its complications. In some cases the flu causes a lethal outcome. To prevent flu everybody needs to be vaccinated. But the flu constantly mutates. Annually in the world appear 3-4 new kinds of the flu. An adult person suffers from flu on the average 2-3 times a year, Children from 6 to 8 times a year. It is connected by the fact that children do not have immunity from old kinds of flu yet. After a person has suffered from flu he gets immunity for all life. But the flu virus is very clever, and constantly changes the external spiral of DNA. Then immunity of the person does not distinguish it. All vaccines are developed for flu on the basis of its varying DNA. But recently scientists have decided to begin working at a vaccine from all kinds of flu. They decided to develop means which to will destroy a flu kernel, instead of its external cover. Therefore it is possible the next three years in the world there will be a vaccine from the Flu after which people will already never be ill with it. But this vaccine is not on sale yet. Therefore at the first symptoms of flu, it is necessary to begin the treatment. Because flu is a serious disease which needs to be treated.
