The vaccine is not only recommended for people at risk, but also for their close contacts who could possibly infect them. Adults and children with heart disease, lung disease such as severe asthma or COPD (Chronic Obstructive Pulmonary Disease), liver or kidney disease, diabetes, chronic muscle disease, reduced resistance due to other diseases or medical treatment and immune disorders. Pregnant women who are in the second or third trimester of their pregnancy during flu season Vaccination can also be useful for healthy 50+ people