Because the virus changes every year, so immunities developed to protect against one won't stop the other one
yes,you can get influenza by kissing,if Your immune system were weak against that virus
In those with healthy immune systems, the exposure to the virus causing the flu will trigger an immune response. This is how our bodies disable the virus so it can not continue to infect us. See the related question in the related questions section for more information on how the immune system works in these situations.
It won't hurt; the flu vaccine is non-virulent and won't lower your immune system while it makes antibodies to the influenza virus. It will still be able to fight off the Bell's Palsy virus (herpes).
Humans are organisms which can become infected by the influenza virus.
The influenza virus, unfortunately, is constantly mutating into new variations which keeps your immune system off guard.
Influenza is a viral infection - it is caused by a virus, not a bacterium.
A link below will show a picture of the influenza virus.
Yes, influenza is a virus.
Influenza is an air-borne virus.
No it is an active virus.
Influenza are a virus type.They do not have cells