Influenza (Flu) is a common disease affecting children and adults.
This disease is caused by a virus, with a peculiar characteristic: virus often change its phenotype (it means: features, composition...), even every year.
In people with chronic illness, like asthmatic people, this trivial disease must be fatal.
This situation happens because influenza can produce pneumonia which drives to loss of pulmonary function and people with asthma can worsen.
But it is possible to prevent this disease using an specific vaccine against influenza.
Because virus often changes, vaccines composition changes frequently according the new virus features.
Our recommendation is: All infants, children, adolescents and adults with asthma must receive influenza vaccine every year.