Even if it is not a good match to the virus now circulating, the vaccine helps ease the severity and duration of symptoms if you come down with the flu.
Children are considered highly vulnerable to the disease. Studies show that for children, a shot can significantly reduce the risk of dying. (The Centers for Disease Control and Prevention reported that 101 children died of flu-related illness in the 2016-17 season.)
High-dose vaccines are recommended for older people, who also are exceptionally vulnerable to illness, hospitalization and death related to the flu, according to the CDC.
"Some protection is better than no protection," Bergen said, "but it's certainly disappointing to have a vaccine that's just not as effective as we'd like it to be."
Shots may still be available from your doctor or local health clinic, as well as at some chain drugstores. Check the Vaccine Finder website at vaccinefinder.org for a location near you.