Seasonal Influenza update

Seasonal influenza viruses circulate worldwide and spread easily from person to person. Seasonal influenza is a serious public health problem that causes severe illness and death in high risk populations. Furthermore, an influenza epidemic can take an economic toll through lost workforce productivity and strained health services. The updated WHO fact sheets is a reminder that influenza vaccination is the most effective way to prevent disease.

Key facts

• Seasonal influenza is an acute viral infection that spreads easily from person to person.

• Seasonal influenza viruses circulate worldwide and can affect people in any age group.

• In temperate climates, seasonal epidemics occur mainly during winter while in tropical regions, influenza seasonality is less obvious and epidemics can occur throughout the year.

• Seasonal influenza is a serious public health problem that causes severe illness and death in high risk populations.

• An influenza epidemic can take an economic toll through lost workforce productivity and strained health services.

• Influenza vaccination is the most effective way to prevent disease.

• Antiviral drugs are available for treatment, though influenza viruses can develop resistance to the drugs.