During the seasonal winter months, cases of flu skyrocket. Many vulnerable members of society are put at risk, pushing healthcare services to the brink. You may have even been offered a flu shot to curb the infection rate. But why is winter flu seasonal? What does it need to survive? And does everyone need to take the vaccine? This is Decomplicated. Check out Decomplicated on Independent TV, across desktop, mobile and connected TV. Watch more on Independent TV: https://www.independent.co.uk/tv/editors-picks Click here to subscribe to The Independent: https://bit.ly/Subscribe-to-Independent About The Independent: Making Change Happen. The Independent is the world’s most free-thinking newsbrand, providing global news, commentary and analysis for the independently-minded. Connect with The Independent: Check out our full video catalog: null Videos, daily editorial and more: http://www.theindy.com/ Click here to get the best of The Independent daily: https://www.independent.co.uk/newsletters Like The Independent on Facebook: https://www.fb.com/TheIndependentOnline Follow The Independent on Twitter: https://twitter.com/Independent Follow The Independent on Instagram: https://www.instagram.com/the.independent Download the iOS & Android app: https://www.independent.co.uk/subscribe/app Help to support truly independent journalism. Every dollar you contribute will directly fund additional special reports and investigations from a free-thinking, award-winning newsroom you can trust - https://www.independent.co.uk/donations Subscribe to Independent Premium for exclusive content & live events: https://bit.ly/2MiOONB