Influenza Vaccination Uptake among the Working Age Population of Japan: Results from a National Cross-Sectional Survey

Abstract

Background: Influenza vaccination rates among Japanese people of working age (20-69 years) is currently suboptimal, and the reasons for this have not been clearly elucidated. This study examined factors associated with vaccination intention among the working age population in Japan during September 2011, one-month prior to influenza vaccination becoming available. Methodology/Principal Findings: A web-based survey of intention to be vaccinated against influenza in the coming season was undertaken among 3,129 Japanese aged 20 to 69 years. Multinomial logistic regression analysis was used to explore the associations between vaccination intent and other variables. Influenza vaccination intent was associated with having been vaccinated in the previous year (Odds Ratio (OR): 3.81; 95% Confidence Interval (CI): 3.75-3.86), the number of children per household (one compared with zero; OR: 1.37; 95%CI: 1.11-1.65), and household income ($50,000 to