 115th Regional Support Unit receives the influenza vaccination in Roseville, California, November 19, 2023. Vaccination for adults. Everyone six months of age and older is recommended to get an annual influenza vaccine, including even healthy adults. Vaccination is especially important for people at higher risk of serious influenza complications or people who live with or care for people at higher risk for serious influenza complications. Persons working in health care settings also should be vaccinated annually against influenza. Vaccination of health care professionals has been associated with reduced work absenteeism and with fewer deaths among nursing home patients.