FAQ: Are there examples of voluntary HCP influenza vaccination programs which actually achieve the 90% coverage target?

Are there examples of voluntary HCP influenza vaccination programs which actually achieve the 90% coverage target? [FAQ Date: April 1, 2013]
Writing in Vaccine in 2011, Helms et al [citation and abstract below] reports on a state-wide program success and the strategies employed in Iowa:

Voluntary reporting of employee influenza vaccination rates by acute care hospitals in Iowa: The impact of a four year provider-based statewide performance improvement project  
Charles Helms, Philip Polgreen, Linnea Polgreen, Thomas Evans, Lance L. Roberts, Gerd Clabaugh, Patricia Quinlisk
Vaccine
http://www.sciencedirect.com/science/journal/0264410X
Volume 29, Issue 18 pp. 3363-3512 (April 18, 2011)
Original Research Article  Pages 3483-3488
Abstract
Objective
In 2006 a voluntary, provider-based project was initiated to improve influenza vaccination rates among healthcare workers (HCPs) employed by acute care hospitals in Iowa. The statewide vaccination target was 95% by 2010. Data from the first four influenza seasons (2006–2007, 2007–2008, 2008–2009 and 2009–2010) are presented.

Methods
A website was used to submit and circulate hospital-specific influenza vaccination rates. Rates were fed back to participating hospitals from the outset and hospital-specific rates made publicly available for the last two influenza seasons.

Results
Hospital participation rates ranged from 86% in season 1 to 100% in the subsequent three seasons. Statewide median hospital employee vaccination rates trended upward from 73% in season 1 to 93% in season 4. By season 4, 35% of participating hospitals had reached or exceeded a 95% vaccination rate. In season 4 the mean employee vaccination rate of 19 hospitals reporting use of a mandatory vaccination policy was 96% vs. 87% in the 64 hospitals not using such policies.

Conclusion
Over a 4-year period, while participating in a provider-based, voluntary project, acute care hospitals in Iowa reported significantly improved seasonal influenza vaccination rates among their employees.

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