Influenza injections are generally referred to as influenza vaccines. Most of these injections are given at intervals of a year in order to protect oneself from the harmful disease of influenza. As the virus changes quite frequently, the researchers have to develop or update new vaccines every year. The influenza injections generally contain three types of virus namely H3N2 virus, H1N1 virus and one B virus. These injections are injected directly into the skin of the humans so that they react to the treatment properly. The immune system of the body improves to a great extent and thus helps in fighting against the dreadful disease of influenza.
  
There are various vaccines available in the market like intramuscular injection or intradermal injection. There are various methods through which these injections can be inserted into the body. They will circulate in the entire body and will make the areas strong where the virus is most likely to attack. The influenza injections should be taken by most of the people in order to avoid the influenza. So the basic purpose of influenza injections is to protect the people from getting affected by this disease. That is why they are recommended to majority of the people.