Influenza (flu) season in the northern hemisphere starts in late fall and peaks in winter. Flu is a common viral disease and affects up to 20% of the world’s population every year. This year the flu season has become more severe and serious. In most cases the flu is benign but it can also have serious consequences, especially in people with compromised immune systems, the elderly, and children. Worldwide, the flu is estimated to cause 250,000 to 500,000 deaths each year.