People at higher risk of developing flu complications include: Young children under 5, and especially those under 2 years Adults older than 65 Residents of nursing homes and other long-term care facilities Pregnant women People with weakened immune systems People who have chronic illnesses, such as asthma, heart disease, kidney disease and diabetes People who are very obese, with a body mass index (BMI) of 40 or higher

There are vaccines that cover 3 strains of flu and vaccines that cover 4 strains of flu. Four-strain flu vaccines may offer you broader coverage with an additional flu strain.