The winter season is always accompanied by a series of respiratory diseases and flu is one of them. Caused by influenza viruses, flu can be diagnosed all year-round, but the cases increase drastically during the fall and winter. One of the reasons is because the virus can live longer indoors in winter due to less humid air.

Influenza or the flu is a highly contagious respiratory virus that can spread from one person to the other through respiratory droplets suspended in the air while sneezing or coughing. There are four types of influenza virus. Of all, influenza A is the most common, followed by influenza B. Both are highly contagious and can lead to severe symptoms like cough, headaches, muscle and joint pain, in severe cases, it can also worsen some chronic medical conditions, such as asthma, heart disease, and diabetes.