Seasonal Influenza Infection Risk Factors of Personnel at Shimane University Hospital

Objectives: A questionnaire survey is performed to investigate the factors associated with seasonal influenza infection at Shimane university hospital. Methods: From 2014 to 2017, questionnaire were distributed to hospital employees who were eligible for vaccination. The sheet includes the following information: age of responders, living situation with children, their preseason vaccination status, and their history of seasonal influenza infection. Results: We analyzed data of a total of 5450 employees, and 6.2% had seasonal influenza infection history in the preceding season. Female sex (odds ratio [OR] 1.364, P < 0.027), aged 30-39 years (vs 20-29 years, OR 2.023, P < 0.001; vs ≥ 60 years; OR 4.206, P < 0.001), and living with children (OR 2.191, P < 0.001) were identified as factors associated with risk of influenza infection. Conclusion: Recognition of these risk factors may be beneficial to prevent and control influenza infection, and hospital employees should pay utmost attention for avoiding secondary influenza infection from households.