Effect of a hospital campaign for influenza vaccination of healthcare workers. 
To identify the factors that inhibit or motivate influenza vaccination among healthcare workers (HCWs).  In March 2000, we prepared 34-item questionnaire for both vaccine recipients and nonrecipients regarding demographic characteristics, factors motivating and inhibiting vaccination, and knowledge and attitudes about influenza vaccination.  On the basis of the results of our survey, an aggressive hospital vaccination campaign was undertaken.  In April 2004, after the 4-year campaign, the same questionnaire was again administered to HCWs.  In both 2000 and 2004, the main motives for undergoing influenza vaccination were "hospital campaign" and "recommendation by colleagues"; the percentage of respondents who were motivated by the hospital campaign had remarkably increased from 27% in 2000 to 52% in 2004 (P<.001), whereas the percentage who were motivated by recommendation by colleagues had not changed significantly (21% vs 14%).  Overall, the 4 reasons most frequently cited by HCWs for noncompliance with vaccination were insufficient available time, confidence in their health, doubt about vaccine efficacy, and fear of injection.  In 2000, vaccination rates were below 30%, irrespective of occupation.  After an aggressive vaccination campaign, the increase in the vaccination rate was highest among the nursing staff, increasing from 21% in 2000 to 92% in 2004, whereas the vaccination rate among the physicians was still below 60%.  We conclude that a hospital campaign can markedly improve influenza vaccination rates among HCWs.  Both a mobile cart system and free vaccine supply contributed to improving the vaccination rates in our study.  In addition, a specifically tailored intervention strategy was required.