Home > Medical > Cold and flu infection > The flu virus The flu virus All sections in Flu » About Flu » Bird flu and SARS » Health Tips » Multimedia » Flu News » Preventing Flu » Spreading the Flu » The 1918 Epidemic » The Flu Virus » Treatment » You and Flu Cold or flu? Both are common in winter and caused by viruses. We often confuse the one with the other. But there is a huge difference between a cold and influenza: influenza may kill you. How flu viruses change The genetic make-up of influenza viruses A and B can change in two ways: a slight change known as antigenic drift and dramatic changes known as antigenic shift. Worldwide flu surveillance The World Health Organisation (WHO) keeps constant surveillance of the human influenza strains circulating around the world. Ask CyberDoc » Test Do you need vitamin C? » Join Body Talk » Quiz Addicted to pills? » No Flu for you 10 foods to boost your immune system The notation of influenza viruses Distinguish between the different types of influenza viruses. The three types of flu viruses There are three types of influenza viruses, namely type A, B and C. load more articles advertisement From our sponsors Your retirement - a healthy mindset So many people, why so alone? You can still enjoy the sweet things in life Take the sugar test, it could save your life.