Influenza Vaccination Levels and Influenza-Like Illness in Long-Term-Care Facilities for Elderly People in Niigata, Japan, During an Influenza A (H3N2) Epidemic

Abstract
Surveys on influenza vaccination and illness in long-term-care facilities in Niigata Prefecture during an influenza A (H3N2) epidemic revealed that >20% of facilities had outbreaks and >10% of residents experienced influenza. Outbreaks and number of cases were significantly reduced by vaccination, which should be strongly recommended for institutionalized elderly people.