Asymptomatic Flu Project

Incidence of Symptomatic and Asymptomatic Influenza Among Healthcare Workers : A Multicenter Cohort Study

Although clinical presentation of influenza is often symptomatic, asymptomatic cases also occur. The knowledge of the incidence of asymptomatic influenza among healthcare workers is very important because of the risk of cross-transmission to hospitalized patients. The principal objective of the study is to estimate the incidence of symptomatic and asymptomatic influenza among healthcare workers in short-stay wards. The results of this study will lead to a better understanding of the burden of asymptomatic influenza among healthcare workers and might be used as an argument to increase influenza vaccine coverage among healthcare workers.

Inclusion Criteria:

• Volunteer health-care workers
• Working in the following wards: short-stay, inpatient (including ICU) and emergency

Exclusion Criteria:

• Presence of influenza symptoms at enrolment
• Programmed absence (maternity leave, vacation, etc.)
• Administrative agents