This year’s vaccine worked in only about half of those who got the inoculation. In better years, the vaccine was 70 percent effective.
Among the elderly, the Centers for Disease Control and Prevention says the vaccine’s has only a 9 percent success rate in fighting this year’s most prevalent flu strain. Experts don’t know why.
Health officials advise elderly people not to try to deal with the flu alone. They say anti-viral medications can help lessen the severity of the illness and avoid the need for hospitalization.