A virus which causes flu is basically referred to as flu virus. Flu virus also known as influenza virus are RNA viruses makes up 3 to 5 genera of orthomyxoviridae family. The flu virus is normally categorized into mainly two types which is influenza A and influenza B. these viruses are extremely harmful and if proper care is not taken to prevent them then the person physical condition can go from bad to worse. ‘Influenza A’ virus mutate rapidly and that is why are considered more dangerous while the latter type does not change over the time.

The doctors and researchers have developed various types of vaccines in order to fight these flu viruses. The flu virus might attack the respiratory system of the human and can cause various infections related to respiration in children as well as adults. One can inactivate the virus with the help of sunlight, detergents and soaps. That is why people often recommend washing their hands frequently. There are various symptoms which can prove that a person is attacked by a flu virus with the help of advanced technologies. The flu virus spreads very fast and so the vaccination of these viruses needs to be updated every year.