Introduction
Seasonal influenza (SI) can present a serious threat to some patients, particularly those with underlying diseases. Healthcare workers (HCW) should use appropriate means to prevent influenza transmission in healthcare settings, with vaccination considered as the most important recommended measure. At our institution, a significant proportion of HCWs refuse vaccination. As an alternative solution to protect patients from SI, HCWs at our hospital are now obliged to be vaccinated or wear masks during SI epidemics. We propose a method for the quantification of adherence to this recommendation.