Overview
Influenza is an acute viral infection that primarily affects the respiratory system. It is characterized by sudden onset of symptoms and can range from mild to severe illness. The virus spreads easily from person to person through droplets when an infected individual coughs, sneezes, or talks. Annual outbreaks occur worldwide, with peak activity during the winter months in temperate regions.
Risk Areas
Influenza is a global concern, with varying levels of activity throughout the year. In temperate climates, flu season typically occurs during the winter months, while in tropical regions, influenza can circulate year-round. Travelers moving between hemispheres or to areas with ongoing influenza activity may be at increased risk.
Risk for Travelers
Travelers are at risk of contracting influenza, especially when visiting areas with active transmission. Factors that may increase risk include: Traveling during peak flu seasons, spending time in crowded places such as public transportation hubs, tourist attractions, or large events or staying in close quarters with others, such as in hostels or shared accommodations.
Signs and Symptoms
- Fever
- Cough
- Sore throat
- Runny or stuffy nose
- Muscle or body aches
- Headaches
- Fatigue (tiredness)
