Increased influenza vaccination of healthcare workers at a pediatric cancer hospital: results of a comprehensive influenza vaccination campaign.

A comprehensive influenza vaccination campaign improved vaccination rates among healthcare workers with direct patient care responsibilities from 45% during the 2003-2004 influenza season to 80% during the 2004-2005 season. A strategy of weekly feedback to unvaccinated employees was the most important factor in enhancing the rate of vaccination acceptance and was particularly effective among the nursing staff.