Influenza is an acute respiratory infection caused by influenza viruses that circulate in all parts of the world. Annually, it is responsible for approximately 1 billion infections worldwide, leading to 3-5 million cases of severe illness and an estimated 290,000 to 650,000 deaths due to respiratory complications.

In temperate climates, seasonal influenza occur mainly during winter periods, while in tropical regions, influenza may occur throughout the year, causing outbreaks more irregularly.

The observed increases in acute respiratory infections and associated pathogen detections in many countries in the Northern hemisphere in recent weeks is expected at this time of year and is not unusual, according to the World Health Organization (WHO).

It can be difficult to tell the difference between influenza and colds because they share many symptoms. influenza symptoms include more severe fever, feeling chills, muscle or body aches, and can have serious associated complications. Colds are usually milder than flu, and generally do not result in serious health problems. Special tests can tell if a person is sick with influenza.

The WHO recommends that individuals should consider wearing a mask in crowded or poorly ventilated spaces, cover coughs and sneezes with a tissue or bent elbow, practice regular handwashing, and get recommended vaccines.