Table of Contents

• Introduction

• Determining the Epidemic Period

• Surveillance in outpatient care

• Surveillance of Emergency Department Visits and Hospitalizations for Influenza

• Virological surveillance

• Surveillance of clusters of acute respiratory infections (ARI) in elderly care facilities

• Surveillance of severe cases admitted to intensive care units

• Surveillance of all-cause mortality

• Discussion — Conclusion

• References

• For more information at the national and regional levels

• Acknowledgments